Temat: geochemical modelling - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Estimation of inorganic carbon sources in groundwater recharge by inverse geochemical modelling (Carboniferous aquifer, the Intra-Sudetic Basin, SW Poland)
Autorzy:: Dobrzynski, D.
Powiązania:: https://bibliotekanauki.pl/articles/2060223.pdf
Data publikacji:: 2008
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: Polska
Sudetes
inverse geochemical modelling
radiocarbon activity
groundwater chemistry
Opis:: Geochemical modelling was applied in quantification of chemical reactions responsible for the chemistry of groundwater in the recharge zone of a Carboniferous aquifer (the Sudety Mts., SW Poland). Calculation of the contribution of dissolved in organic carbon (DIC) sources allowed estimation of the initial radiocarbon activity in the recharge to groundwater. The 14C activity calculated upon the results of geochemical modelling is consistent with the 14C activity measured in groundwater. Geochemical modelling can be applied for estimation of the initial 14C activity in recharge water as well as the 14C activity in groundwater along the flow path. Methods of geochemical modelling have an advantage over empirical methods because they combine the effects of various chemical reactions occurring in the geochemical system.
Źródło:: Geological Quarterly; 2008, 52, 2; 191-191
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: The evolution of arc magmatism related to Palaeotethys in the west of Salmas, north of the Sanandaj-Sirjan Zone, Iran
Autorzy:: Fazlnia, A.
Powiązania:: https://bibliotekanauki.pl/articles/2060346.pdf
Data publikacji:: 2017
Wydawca:: Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:: layered gabbros
massive gabbrodiorite
appinite
geochemical-mineralogical modelling
tectono-magmatic model
Zagros
Opis:: The Mingol-Mamakan gabbroic-appinitic intrusions are located in northwestern part of Iran and belong to the Sanandaj–Sirjan zone (SSZ). These intrusions have had a significant impact on evolution of the northwestern part of the SSZ during Upper Carboniferous. The rocks typically include layered and massive gabbros-gabbrodiorites. The age of layered gabbros is 303-300 Ma and they mainly consist of leuco-gabbro, mezzo-gabbro, melano-gabbro, anorthosite, and hornblendite (appinite) with gradational or sharp bedding contacts alternatively. Layered gabbros with 314-322 Ma are mostly composed of leuco-gabbro, mezzo-gabbro, melano-gabbro, and hornblendite. Most of these samples are appinite in composition. The intrusions show no obvious deformation. Therefore, mineral composition changes in the rocks have been controlled by crystallization processes, such as fractionation in the magma chamber. Our investigations indicate that different rock types with tholeiitic magma series are probably derived from partial melting of spinel lherzolite upper mantle co-genetic source. Geochemical information and dating from the Mingol-Mamakan intrusive rocks reveal that the intrusions were formed of subduction-related immature or sub-mature island arc tholeiitic basalt which is enriched in Al2O3, FeO, Sr and depleted in K and Nb. Subsequently, primary tholeiitic arc basalt magma underwent fractional crystallization to form intrusive rocks at the lower crust, relatively in high pressures conditions. Geochemical modeling based on the partition coefficient of elements in minerals indicates that trace elements concentrations (large-ion lithophile elements, LILEs, high field strength elements, HFSE, and rare earth elements, REEs) in the Mingol-Mamakan intrusions throughout the crystallization were controlled by variable amounts of common minerals such as amphibole, clinopyroxene (for all trace elements) plagioclase (only for LILE) and probably spinel in the source rock (only for HFSE). Moreover, elements of first transition series of periodic table mainly controlled by orthopyroxene, olivine and possibly by clinopyroxene and amphibole in much smaller amounts.
Źródło:: Geological Quarterly; 2017, 61, 1; 124--137
1641-7291
Pojawia się w:: Geological Quarterly
Dostawca treści:: Biblioteka Nauki

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