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Wyszukujesz frazę "geochemistry" wg kryterium: Temat


Tytuł:
Geochemical features of the mafic rocks in the Khangai-Daur belt, central Mongolia
Autorzy:
Nadmid, Bayart
Tsukada, Kazuhiro
Asahara, Yoshihiro
Oidov, Munkhtsetseg
Powiązania:
https://bibliotekanauki.pl/articles/24202089.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
geochemistry
Mongolia
Opis:
The Late Paleozoic–Early Mesozoic accretionary complexes of the Khangai-Daur belt, in central Mongolia, lie between the Siberian craton and the North China block. These complexes consist of Silurian mafic rocks (basalt, dolerite, and gabbro), Silurian–Devonian radiolarian cherts, and Carboniferous clastic rocks. While the mafic rocks are considered oceanic island alkaline, few studies have been conducted, and their classification is still under discussion. Understanding the petrogenesis and tectonic setting of these mafic rocks within the accretionary complexes is crucial for comprehending the tectonic evolution of ancient oceanic plates. This study involves geochemical analyses of 39 mafic rock samples and whole rock Sr-Nd isotopes from 24 mafic rock samples collected from four localities within the Khangai-Daur belt: Uubulan, Ikh-Oortsog, Takhilt area in the Ulaanbaatar terrane, and the Burd area in the Kharhorin terrane. Geochemically, all mafic rocks from the Uubulan, Ikh-Oortsog, and Takhilt area exhibit the signature of ocean island basalt (OIB). They are characterized by alkaline affinity with enrichment in large ion lithophile elements (LILE) and light rare earth elements (LREE), as well as depletion in high field strength elements (HFSE) and heavy rare earth elements (HREE), resulting in a high concentration of ((La/Yb)cn = 4.5–15.6). In contrast, the mafic rocks from the Burd area exhibit tholeiitic-like affinity with less enrichment in LILE and LREE, and depletion in HFSE and HREE, resulting in a concentration of ((La/Yb)cn = 1.4–3.0). Therefore, the Ti/Y vs. Nb/Y and Ti vs. Zr ratio diagrams suggest that the samples were formed in a within-plate setting. Our latest study reveals that the hornblende K-Ar age (412.7 Ma ±8.6 Ma) of the mafic rocks and the reconstruction of the oceanic plate stratigraphy of the accretionary complex at Uubulan indicate a Late Silurian age. The Sr-Nd isotopic compositions ((87Sr/86Sr)i = 0.7040–0.7078, εNd(t) = 5.0–9.3) suggest that the magmas were derived from a deep OIB reservoir, indicating slightly heterogeneous magma sources. Overall, the results of this study suggest that alkaline and tholeiitic magmatism may have occurred during the Late Paleozoic within the oceanic plate between the Siberian craton and the North China blocks.
Źródło:
Geotourism / Geoturystyka; 2023, 1-2 (72-73); 54--54
1731-0830
Pojawia się w:
Geotourism / Geoturystyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of the Triassic–Jurassic lateritic bauxites of the Salt Range: implications for eastward extension of the Tethyan bauxite deposits into Pakistan
Autorzy:
Iqbal, Saqib
Bibi, Mehwish
Wagreich, Michael
Powiązania:
https://bibliotekanauki.pl/articles/24202138.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Pakistan
geochemistry
Tethys
Opis:
Bauxite deposits are residuals of intense lateritic weathering under warm and humid palaeoclimates. The Triassic– Jurassic Boundary (TJB) interval in the Salt Range, Pakistan, provides one such case of bauxite deposits formation along the SW tropical Neo-Tethyan passive margin. Thick, red bauxites/bauxitic clays occur at the contact of the Upper Triassic Kingriali Formation and the Lower Jurassic Datta Formation. These bauxites are rich in kaolinite, haematite, boehmite (Al2O3 and Fe2O3), and are depleted in silica (SiO2). Geochemical proxies of the succession signal intense chemical weathering of the parent siliciclastics under Mesozoic “greenhouse” conditions. Certain trace elements and Rare Earth Elements (REEs) are enriched up to seven times compared to mean Upper Continental Crust (UCC) values. These bauxites are synchronous with the Amir-Abad bauxites of the Alborz Mountains, central Iranian Plateau, that occur between the thick Triassic dolomite/dolomitic limestones of the Elika Formation and the Lower Jurassic Shemshak Formation. Thus, the Salt Range, Pakistan, provides evidence for the eastward extension of the Irano-Himalayan bauxites that are extended westward into Mediterranean bauxites, and the western Tethys by correlation with European bauxites. The TJB bauxites in the Salt Range support increased chemical weathering on the SW Neo-Tethyan passive margin and correspond to an associated sea-level fall during this time interval. This supports the Neo-Tethyan tectonics contribution in the formation of bauxite deposits during the Triassic–Jurassic in addition to the widely studied karst-bauxites that formed in response to the subduction and orogenic processes in the Paleo-Tethys.
Źródło:
Geotourism / Geoturystyka; 2023, 1-2 (72-73); 30--30
1731-0830
Pojawia się w:
Geotourism / Geoturystyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
New biostratigraphical and geochemical data from the mélange complexes of the Meliata Unit s.s., Čoltovo village (Western Carpathians, Slovakia)
Autorzy:
Matejová, Marína Molčan
Potočný, Tomáš
Plašienka, Dušan
Powiązania:
https://bibliotekanauki.pl/articles/24202085.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
Carpathians
biostratigraphy
geochemistry
Opis:
The surrounding of the Čoltovo village is a well-known location related to the Meliata Superunit (especially Meliata Unit s.s.). The Meliata Unit is represented by intricate mélange complexes linked to the closure of the ancient Meliata Ocean, as a significant part of the Western Carpathians geological story. In general, Meliata complexes are divided into HP/LT Permian to Jurassic metamorphosed clastic sediments, carbonates and basic volcanics (Bôrka Nappe) and complexes of “mixed chaos” of the Jurassic low grade shales with huge Triassic olistostrome bodies (Meliata Unit s.s.), the latter being the main subject of this work. Outcrops near the village of Čoltovo along the slopes of the W–E trend on the Slaná River bank provided limited information only. Therefore, new parts were excavated in March/2022. After removal of debris, the very complex internal structure of the mélange can be clearly detectable. This new section is composed of six individual outcrops (ČLP1 to ČLP6 from left to right) and consists of two contrasting lithological parts. The eastern part is mainly characterized by strongly weathered gray fine-grained shales and tuffs containing blocks of lithologically variable rocks. These are mainly represented by basic volcanics and dark coarse-grained Jurassic crinoidal limestones. The western part of the section consists of red and white fine-grained siliciclastics with basic volcanic material, and blocks of dark red, green and purple radiolarites. In the upper parts of the outcrops, layers of dark crinoidal limestones, shales and conglomerates of the Jurassic age are present. The connection between these beds and the mélange is documented by their presence as blocks in the left part of the section. The mélange complexes are overstepped by the Lower Miocene organodetritic limestones, sandstones and breccias (Bretka Beds). Three samples from the western part of the new outcrops gave identifiable Middle Triassic radiolarians. In addition, an old outcrop to the east of the newly excavated section, provided a productive sample with Upper Triassic radiolarian microfauna. Our research was also focused on geochemical analyses of radiolaria-bearing siliciclastics and basic volcanics, aiming at understanding the palaeoenvironment of the Meliata Ocean. All of the sediment samples gave similar results, which point to shallow marine environment, close to the continental margin. The geochemical data indicate a mature continental sedimentary provenance. Based on these data, we interpret the source of the samples located to the north of the Meliata Ocean (possibly Permian clastics of the Gemer Unit). Basic volcanics sample from the right side of the section confirms basalt/basaltic andesite composition. From the study of the Čoltovo section it seems the sedimentary matrix of the olistostrome probably originated from a passive continental margin and it is mixed with advanced ophiolite-bearing nappes within a Jurassic accretionary mélange (Meliata Unit s.s.).
Źródło:
Geotourism / Geoturystyka; 2023, 1-2 (72-73); 52--52
1731-0830
Pojawia się w:
Geotourism / Geoturystyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogy and petrology serving society: challenges for the 21st century
Autorzy:
Hovorka, Dušan
Powiązania:
https://bibliotekanauki.pl/articles/2086513.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
geochemistry
petrology
meeting
Opis:
One of the topical problems of science in general at present is spreading the newest discoveries among population as well as among the decision-makers. “Mineralogical sciences” (mineralogy, geochemistry, petrology) affect the wide spectrum of human activities. Such an influence can already be traced in prehistory, and in the modern age the significance of the mentioned geoscience branches is on the increase. The author presents here a review of selected applications of mineralogical sciences in the development of mankind.
Źródło:
Mineralogia; 2009, 40, 1/4; 15--30
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mineralogy and petrology serving society: challenges for the 21st century
Autorzy:
Hovorka, D.
Powiązania:
https://bibliotekanauki.pl/articles/2086553.pdf
Data publikacji:
2009
Wydawca:
Polskie Towarzystwo Mineralogiczne
Tematy:
geochemistry
petrology
meeting
Opis:
One of the topical problems of science in general at present is spreading the newest discoveries among population as well as among the decision-makers. “Mineralogical sciences” (mineralogy, geochemistry, petrology) affect the wide spectrum of human activities. Such an influence can already be traced in prehistory, and in the modern age the significance of the mentioned geoscience branches is on the increase. The author presents here a review of selected applications of mineralogical sciences in the development of mankind.
Źródło:
Mineralogia; 2009, 40, 1/4; 15--30
1899-8291
1899-8526
Pojawia się w:
Mineralogia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Antropogeniczne przeobrażenia oerodowiska geochemicznego aluwiów Zagożdżonki [Puszcza Kozienicka]
Anthropogenic changes of geochemical environment in Zagożdżonka river alluvium sediments [Central Poland]
Autorzy:
Lis, J.
Parafiniuk, J.
Pasieczna, A.
Powiązania:
https://bibliotekanauki.pl/articles/2074509.pdf
Data publikacji:
2007
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
alluvium
geochemistry
Polska
Opis:
The paper presents detailed geochemical survey of stream sediments in Zagożdżonka river system. The Zagożdżonka river drains agricultural areas and forests [Puszcza Kozienicka] and flows through towns-Pionki and Kozienice. The works [metallurgical, power plants, plastic materials, munitions-factory localized in towns put industrial and communal sewage into Zagożdżonka river. Active sediments (180 samples; <0.2 mm) were leached with HCl (1:4); then, using the ICP-AES method determinations were made the concentration of Ag, Al, As, Ba, Be, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, P, Pb, S, Sr, Ti, V and Zn. Mercury concentration was measured using the CV-AAS method. The geochemical survey reveals that industrial plants activity are the main sources of anthropogenic pollution of stream sediments in Zagożdżonka river catchment. The strong local anomalies of As, Be, Ca, Cd, Cr, Cu, Hg, Ni, Pb, Sr, Ti and Zn near Pionki and Kozienice towns can be related to low efficiency of sewage treatment plants in metal removing.
Źródło:
Przegląd Geologiczny; 2007, 55, 1; 79-79
0033-2151
Pojawia się w:
Przegląd Geologiczny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Department of Environmental Protection
Autorzy:
Ciszewski, D.
Powiązania:
https://bibliotekanauki.pl/articles/184294.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
geochemistry
mineralogy
pollution
Źródło:
Geology, Geophysics and Environment; 2016, 42, 2; 252-255
2299-8004
2353-0790
Pojawia się w:
Geology, Geophysics and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Glacial deposits of the northern region adiacent to Petuniabukta in the light of mineralogical and chemical studies, central Spitsbergen
Autorzy:
Stankowska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2053116.pdf
Data publikacji:
1989
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Arctic
Spitsbergen
glaciology
geochemistry
Źródło:
Polish Polar Research; 1989, 10, 3; 303-316
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiolarian age and geochemical characteristics of the Permian bedded chert sequence in the Soi Dao area, Chanthaburi, Southeast of Thailand
Autorzy:
Phromsuwan, Waraphorn
Kamata, Yoshihito
Ueno, Katsumi
Charoentitirat, Thasinee
Sardsud, Apsorn
Powiązania:
https://bibliotekanauki.pl/articles/24202091.pdf
Data publikacji:
2023
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
geochemistry
Thailand
Permian bedded
Opis:
Permian chert and siliceous mudstone in the Soi Dao, Chanthaburi Thailand are extracted the details on radiolarian assemblage and age, change of depositional environment, and geochemical characteristics. Permian radiolarians were obtained in three study areas (ASD01, ASD14 and ASD09); which radiolarian age of each section is as follows: ASD01: Early Asselian to Early Sakmarian, ASD14: Late Sakmarian to Artinskian, and ASD09: Capitanian to Early Changhsingian. Considering the lithofacies, ages, and chemical composition of the rocks, a preliminary stratigraphy consisting of basaltic rock, radiolarian bedded chert, siliceous mudstone, and coarse-grained clastic of alternation of sandstone and mudstone in ascending order can be reconstructed. Data on geochemistry analysis, particularly chondrite-normalized REEs patterns of chert and siliceous mudstone, present a gradual change in that degree of the Ce negative anomaly decrease toward the stratigraphical upper position. These changes indicate that the depositional site of the Permian rocks transferred from a state of high hydrothermal activity to a state of weakened activity and that the influx of terrestrial clastics increased. Permian bedded cherts accompanied by basalts and siliceous mudstones recognized in the study area closely resemble to the Paleo- ‑Tethys bedded cherts in terms of their lithofacies and microscopic features; however, their depositional period is much shorter than that of the Paleo-Tethys, indicating that it was deposited in another oceanic basin. The chemical compositions also show that the influence of hydrothermal activity weakened from the strong state, and the terrigenous clastics rapidly supplied.
Źródło:
Geotourism / Geoturystyka; 2023, 1-2 (72-73); 56--56
1731-0830
Pojawia się w:
Geotourism / Geoturystyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of germanium in thermal waters of the Jelenia Góra geothermal system (Sudetes, Poland) : solute relationships and aquifer mineralogy
Autorzy:
Dobrzyński, Dariusz
Tetfejer, Klaudia
Stępień, Marcin
Karasiński, Jakub
Tupys, Andrii
Słaby, Ewa
Powiązania:
https://bibliotekanauki.pl/articles/24459856.pdf
Data publikacji:
2023
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Germanium
groundwater geochemistry
geothermal water
granite geochemistry
Karkonosze Granite
Jelenia Góra geothermal system
Opis:
A long-term (2004–2021) study of the chemical composition of thermal waters in the Jelenia Góra geothermal system provided information on a wide set of components. The subject of the present study is the geochemistry of germanium (Ge), which occurs in concentrations ranging from 2.7 to 6.3 μg/L in the waters studied. Interpretation of a set of 46 chemical analyses identified relationships between germanium and other elements in thermal waters from individual intakes. In the old thermal waters of Cieplice and Karpniki of deep circulation, germanium is derived from silicates and its concentration is controlled by the solubility of Ge-bearing quartz with an average Ge content of 1.5 μg/g. The source of germanium in the deep old thermal water at Staniszów is mainly sulphides, most likely arsenopyrite, but the secondary contribution of Ge from silicates (biotites, amphiboles) should not be ignored. The mineral phase, responsible for controlling Ge activity in this water, cannot yet be identified. The shallow thermal waters at Cieplice, which are a mixture of old thermal waters and modern waters, differ from the deep waters. Germanium in shallow waters probably is derived from silicates, but owing to mixing, there are no chemical equilibrium conditions; the concentration of Ge is determined by the dynamic equilibrium of the mixed water components. The modern water of intake no. 2 (Cieplice) differs from other shallow waters and also shows similarities to the Staniszów water. The germanium in the no. 2 water probably comes mainly from ferromagnesian minerals (biotite, amphiboles), although the influence of sulphides cannot be excluded. The relationships of germanium to other elements, including the Ge/Si ratio, appear to be effective indicators of hydrogeochemical conditions. Thermal waters from the different locations show both similarities and differences in chemical composition,especially of minor and trace components. At the present, still weak stage of recognition, the Jelenia Góra geothermal system can be treated as an area of occurrence of local systems responsible for the quantity and quality of thermal waters in individual intakes.
Źródło:
Annales Societatis Geologorum Poloniae; 2023, 93, 3; 323--344
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Molecular indicators for coal-forming palaeoplant community. "Katrishte" Coal deposit
Autorzy:
Stefanova, M.
Markova, K.
Marinov, S.
Powiązania:
https://bibliotekanauki.pl/articles/1204892.pdf
Data publikacji:
2002
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
coal
organic geochemistry
biomarker assemblage
Opis:
Coal deposit "Katrishte" located in south-western Bulgaria, Ro = 0.34%, was subjected to geochemical study. By chromatographic and spectral methods, a variety of coal biomarkers in bitumen extract has been revealed. n-Alkane distribution pattern indicated at least two possible sources, lacustrine and terrestrial ones. The aliphatic fraction was strongly dominated by 16a(H)-kaurane and 16a(H)-phyllocladane, a proof for the presence of Pinales in coal-forming palaeoplant community. The kaurane prevalence over phyllocladane could indicate the herbaceous flowering plant contribution. The combination of sesquiterpenoids/diterpenoids pointed to Pinaceae and Araucariceae.As a biomarker assemblage peculiarity, the lack of isoprenoids, tricyclic diterpenoids, and pentacyclic triterpenoids could be indicated.Our data gave us ground to assume existence of bush moor with the presence of herbaceous flowering plants, and subordinate contributions of conifers and sedge-reeds to coal forming plant taxa of "Katrishte"
Źródło:
Polish Geological Institute Special Papers; 2002, 7; 245-252
1507-9791
Pojawia się w:
Polish Geological Institute Special Papers
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorine in ornithogenic soils and minerals on King George Island, West Antarctica
Autorzy:
Tatur, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2053276.pdf
Data publikacji:
1987
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Antarctica
geochemistry
ornithogenic soil
phosphates
fluorine
Źródło:
Polish Polar Research; 1987, 8, 1; 65-74
0138-0338
2081-8262
Pojawia się w:
Polish Polar Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemical and tectonic characteristics of manganese mineralization in the Yozgat region, Turkey
Autorzy:
Öksüz, Nursel
Koçak, İsmail
Temiz, Uğur
Powiązania:
https://bibliotekanauki.pl/articles/2059613.pdf
Data publikacji:
2021
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
manganese
geochemistry
hydrogenetic
hydrothermal
Yozgat
Turkey
Opis:
North of the Central Anatolian Crystalline Complex and bordered by the İzmir–Ankara–Erzincan Suture Zone, mineralization occurs within ophiolites known as Anatolian Ophiolite Complex. The mineralization is present within banded, laminated and lenticular radiolarites which are intensely fractured and folded. It is distributed around Derbent, Baltasarilar, Cihanpasa, Buyukmahal, Eymir and Kadisehri where pyrolusite, psilomelane, manganite and braunite comprise the main paragenesis and jacobsite, magnetite, limonite and goethite are minor phases. The negative Eu anomaly suggests that the hydrothermal source was distant from the mineralization area or was mixed with seawater. All samples from the Cihanpasa and Buyukmahal areas have a negative Ce anomaly and resemble low-temperature hydrothermal mineral deposits. Samples from other locations (Derbent, Baltasarilar, Cihanpasa, Eymir, Buyukmahal, Tarhana) are characterized by both negative and positive Ce anomalies. From this it can be inferred that both hydrothermal and hydrogenetic processes were active in mineralization. High Ba contents and a LREE-enriched pattern together with negative Ce anomalies and trace element distributions indicate that the mineralization in the area was derived from a primary hydrothermal source. In addition, diagenetic and epigenetic processes may also have played an important role in the manganese mineralization.
Źródło:
Geological Quarterly; 2021, 65, 2; 65: 31
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Environmental stress in the northern Tethys during the Paleogene : a review of foraminiferal and geochemical records from the Polish Outer Carpathians
Autorzy:
Olszewska, B.
Szydło, A.
Powiązania:
https://bibliotekanauki.pl/articles/2060601.pdf
Data publikacji:
2017
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Outer Carpathians
Polska
Paleogene
foraminifera
geochemistry
Opis:
During the Paleogene, the area of the northern Tethys was controlled by a turbidity system stimulated by diastrophic and geodynamic processes. These factors contributed to the dispersion and rapid oxygenation of organic debris. Its accumulation was a consequence of stagnant bottom water conditions that periodically occurred in the basin. In these periods, intense decomposition intensified by hydrothermal and diagenetic processes was associated with oxygen consumption and the release of greenhouse gases, which led to hypoxia and acidification. These phenomena intensified by thermal and density stratification had a major impact on the structure, evolution and distribution of biota. Stress associated with rapidly changing conditions induced by sedimentary process and upwelling resulted in the dominance of forms that colonized most sediments (Glomospira, Ammodiscus, Recurvoides, Rzehakina) and surface waters (Guembelitria, Chiloguembelina, Globanomalina, Globigerina, Cassigerinella, Catapsydrax). At the time, foraminifera were limited to low-diversified eutrophic assemblages or were mainly replaced by siliceous phytoplankton (radiolarians and diatoms). Geochemical data confirm that environmental crises in the Paleogene basin took place under changing thermal conditions that reflect global events (KTBE, PTME, EEOC and TTE). Thermal stress favouring the formation of certain minerals or rocks occasionally occurred during the Paleocene to Eocene (siderite, phosphates) and dominated in the Early Oligocene (silica).
Źródło:
Geological Quarterly; 2017, 61, 3; 682--695
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geochemistry of shales of the Qadir Member (Nayband Formation, Upper Triassic), East Central Iran (Tabas Block) : implications for provenance and palaeogeography
Autorzy:
Zamaniyan, Ehsan
Khanehbad, Mohammad
Moussavi-Harami, Reza
Mahboubi, Asadollah
Powiązania:
https://bibliotekanauki.pl/articles/2058574.pdf
Data publikacji:
2019
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
Triassic
Nayband Formation
Tabas
provenance
geochemistry
Opis:
The Upper Triassic shale of the Qadir Member of the Nayband Formation, East Central Iran has been analysed geochemically to evaluate provenance and palaeogeography. The Qadir Member in the Parvadeh Coal Mine section is 450 metres thick, and includes sandstone, shale, coal, siltstone, and fossiliferous limestone. XRD analysis of shale samples from the Qadir Member largely indicated the presence of illite and chlorite, with small amounts of kaolinite and montmorillonite. On binary and triangular diagrams the data suggests an intermediate igneous source rock for these shales. Plotting the geochemical data on binary diagrams also indicates the tectonic setting of an active continental margin, perhaps reflecting the Early Cimmerian tectonic event with Neothetys subduction under the Iran Plate, and collision of the Iran Plate with Turan during the Late Triassic. The Chemical Index of Alteration (CIA) and Plagioclase Index of Alteration (PIA) values for shale from the Qadir Member of Nayband Formation vary from 74.04 to 80.54 (average 78.02) and 84.31 to 91.85 (average 87.81), respectively, indicating moderate to high chemical alteration in the source area and suggesting a semi-humid climate during deposition. The geochemical data and palaeogeographical models indicate that the Qadir Member shale was deposited on an active margin in a shoreline to transitional-marine setting.
Źródło:
Geological Quarterly; 2019, 63, 3; 603--618
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł

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