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Geochemistry of siltstones in the North Qilian Zhongbao–Mayinggou formations (Late Ordovician–Early Silurian): implications for paleoclimate, paleoweathering, and tectonic setting

التفاصيل البيبلوغرافية
العنوان: Geochemistry of siltstones in the North Qilian Zhongbao–Mayinggou formations (Late Ordovician–Early Silurian): implications for paleoclimate, paleoweathering, and tectonic setting
المؤلفون: Yu Xia, Qian Hou, Chuanlong Mou
المصدر: Frontiers in Earth Science, Vol 12 (2024)
بيانات النشر: Frontiers Media S.A., 2024.
سنة النشر: 2024
المجموعة: LCC:Science
مصطلحات موضوعية: clastic sediment geochemistry, Ordovician–Silurian, sedimentary rocks, tectonic setting, provenance, paleoweathering, Science
الوصف: The Late Ordovician–Early Silurian period witnessed the Phanerozoic mass extinction, glacial events, and volcanic events. Paleoweathering indexes chemical index of alteration (CIA), chemical index of weathering (CIW), and plagioclase index of alteration (PIA) indicated that the source area weathering changed from weak to moderate to intense. CIA values in the upper Zhongbao formation ranged from 66.71% to 73.97%, indicating a drier and colder climate. Upward, the CIA values on the bottom of the Mayinggou formation returned to the high value quickly (from 73.86% to 81.31%), suggesting that the ice age ended, the climate became warmer and wetter, and the sea level rose. The Al2O3–(CaO*+Na2O)–K2O triangular plots, Hf-La/Th, and SiO2–Al2O3/TiO2 bivariate plots inferred that the source of the siltstones in the two formations is mostly from the felsic igneous rocks. The samples from the Zhongbao–Mayinggou formations have chondrite-normalized rare earth element (REE) patterns similar to that of the North Qilian volcanic arc rocks. Geochemical discrimination plots displayed that the sediments of the Zhongbao–Mayinggou formations came from the active continental margin setting.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 2296-6463
Relation: https://www.frontiersin.org/articles/10.3389/feart.2024.1334982/full; https://doaj.org/toc/2296-6463
DOI: 10.3389/feart.2024.1334982
URL الوصول: https://doaj.org/article/463ad8f8e42640ae99ba4948b2f00ff8
رقم الانضمام: edsdoj.463ad8f8e42640ae99ba4948b2f00ff8
قاعدة البيانات: Directory of Open Access Journals
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