特提斯构造域东部阿普特期阶前海洋缺氧事件中碳同位素记录和古海洋变化：对富有机沉积物累计的影响

早白垩世巴雷姆期和阿普特期大气-海洋系统发生了显著变化，该时期可以提供关于全球构造运动有价值的信息。在文章中，我们提供了位于东特提斯构造域的羌塘盆地早白垩世阿普特期大洋缺氧事件（OAE 1a）之前的胜利河剖面沉积物的高分辨率无机碳同位素和地球化学数据。根据无机碳同位素曲线，我们识别出了10个小的部分，这是特征性的巴雷姆期-早阿普特期碳同位素变化模式，可以进行较好的国际对比。在巴雷姆期-阿普特期，无机碳同位素最显著的特征就是出现多次负偏移，每一次偏移可能都与气候变化有关。在晚巴雷姆期，我们发现了两个无机碳同位素的峰值，这一般与增加的初级生产力和伴随增加的生产力产生的厌氧条件有关。我们的数据表明：页岩沉积时期的缺氧环境是在半封闭的泻湖环境中形成的。虽然较高的生产力和缺氧环境有利于有机质的富集，然而这些条件可能是局部的，并不是控制胜利河剖面富含有机质沉积物沉积的原始机制。我们认为富含有机质页岩的沉积极有可能是全球/区域变暖造成的。温度增加和水温循环加剧有利于提高初级生产力，从而导致水体中氧气最小空间的扩张。

The atmospheric-ocean system underwent significant changes during the Barremian and Aptian stages of the Early Cretaceous, a period that provides valuable insights into global tectonic movements. Herein, we present high-resolution inorganic carbon isotope and geochemical data of sediments from the Shengli River section located in the Qiangtang Basin of the Eastern Tethys Tectonic Domain, prior to the Aptian Oceanic Anoxic Event 1a (OAE 1a) of the Early Cretaceous. Based on the inorganic carbon isotope curves, we identified 10 minor segments that represent the characteristic carbon isotope variation pattern of the Barremian to early Aptian, which allows for robust international correlation. During the Barremian-Aptian interval, the most prominent feature of the inorganic carbon isotope record is the occurrence of multiple negative excursions, each of which may be linked to climate change. In the late Barremian, we detected two inorganic carbon isotope peaks, which are generally associated with enhanced primary productivity and the accompanying anaerobic conditions induced by increased productivity. Our data indicate that the anoxic environment during shale deposition formed in a semi-enclosed lagoonal setting. Although elevated productivity and anoxic conditions are conducive to organic matter enrichment, these conditions may be local and not the primary mechanism controlling the deposition of organic-rich sediments in the Shengli River section. We propose that the deposition of organic-rich shale is most likely caused by global/regional warming. Increased temperature and intensified water circulation facilitate elevated primary productivity, which in turn leads to the expansion of the oxygen minimum zone in the water column.