Lipid Biomarker and Stable Isotopic Profiles through Late Carboniferous–Early Triassic of the Deepest Well MS-1 in the Junggar Basin, Northwest China

The Carboniferous–Triassic period was an important stage of global sea–land transformation, with coal formation in the Carboniferous, biological extinction at end Permian, and drought Triassic. MS-1 well Mosuowan High Junggar Basin is deepest drilled Northwestern China. In this paper, we investigate sedimentary environment climate evolution area central during Late Carboniferous–Early Permian by petrothermal, lipid biomarker, isotopic composition mud shale core samples, explore tectonic–climatic events Central Asian orogenic belt driving environment. study shows that organic matter from Upper Carboniferous to Lower a mature stage, but biomarkers maintained primary information although subjected thermal evolution. late (Tamugan Formation), closed remnant sea relatively humid climate, triggering lush terrestrial vegetation high carbon content sediments, which had potential evolve into natural gas. During Xiazijie Formation Middle tectonic activity shifted subsidence period, salinity water decreased after large input fresh water. lake basin expanded, aquatic organisms continued increase. As stratigraphy missing, transition seems jump. low upper Urho Formations Middle–Upper are deltaic foreland deposit, geochemical indicators show overall retreat process continuous increase origin. lithologic assemblage Triassic Baikouquan braided river sedimentation migration deposition centers basin. conclusion, influenced changes, Paleo-Asian Ocean subduction, continental splicing, resulted matter, desalination, oxidation-rich sediments region, P–T mass event not recorded.