Geochemical Characteristics of Carbonates and Indicative Significance of the Sedimentary Environment Based on Carbon–Oxygen Isotopes and Trace Elements: Case Study of the Lower Ordovician Qiulitage Formation in Keping Area, Tarim Basin (NW China)
Source abstract
Abstract
The carbonate rock of the Qiulitage Formation is a significant stratum for oil and gas exploration in the Tarim Basin. To elucidate its environmental characteristics, we conducted tests and analyses of trace elements, carbon, and oxygen isotopes of the carbonate rocks of the Qiulitage Formation in the Kekeqigankake section of the Keping area. The results reveal that δ13C values range between −1.7‰ and 4.3‰, with an average value of 1.645‰. δ18O values fluctuate from −11.4‰ to −6‰, with an average value of −8.2475‰. Z values (paleosalinity) vary from 120.33 to 131.67, significantly exceeding 120 with an average value of 126.52, indicating a marine sedimentary environment. Paleotemperature values (T) range from 12.75 to 29.09 °C, with an average value of 21.36 °C, suggesting warm climate conditions. The Sr/Ba (3.42~24.39) and Sr/Cu (57.5~560) ratios are elevated, while Th/U (<1.32) and V/Cr (0.989~1.70) ratios are reduced, suggesting that the Qiulitage Formation was deposited in an oxygen-rich, warm marine sedimentary environment with relatively high salinity.
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Research context
OpenAlex topics: Hydrocarbon exploration and reservoir analysis · Paleontology and Stratigraphy of Fossils · Geochemistry and Elemental Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Yantai Center of Coastal Zone Geological Survey, China Geological Survey, Yantai 264004, China
School of Environment, China University of Geosciences, Wuhan 430074, China
Ministry of Natural Resources Observation and Research Station of Land-Sea Interaction Field in the Yellow River Estuary, Yantai 264000, China
State Key Laboratory of Shale Oil and Gas Enrichment Mechanisms and Effective Development, Beijing 100083, China
School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
Funding
China Geological Survey Project
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