Microbialites, often considered as a signal of extreme marine environment, are common in the Lower Triassic strata of South China where they flourished in the aftermath of the end-Permian mass extinction. Early Triassic microbialite facies are known to vary palaeogeographically, perhaps due to differing climates, ocean chemistry, and water depths. This paper provides the first record of a brief, but spectacular development of microbialites in the aftermath of the end-Permian mass extinction at Panjiazhuang section, Changxing Region of Zhejiang Province (eastern South China). Here, the Upper Permian Changxing Formation comprises typical shallow platform facies rich in calcareous algae and foraminifera, the development of which was terminated by the major end-Permian regression. A 3.4-m-thick microbialite began to form at the onset of the transgression in the earliest Triassic. The microbialite at Panjiazhuang section is composed of thrombolite that contains abundant calcified cyanobacteria, small gastropods, microconchid tubes and ostracods, representing a low-diversity shallow marine community in the aftermath of the end-Permian crisis. The microbialites are succeeded by thin-bedded micrites bearing thin-shelled bivalves, which record a rapid sea-level rise in the Early Triassic. Abundant populations of small pyrite framboids are observed in the upper part of the microbialites and the overlying thin-bedded micrites, suggesting that dysoxic water conditions developed at that time. The appearance of microbialites near the Permian–Triassic boundary (PTB) at Panjiazhuang section was the result of peculiar marine conditions following the end-Permian regression, whilst their disappearance was due to the increasing water depth and the development of dysoxia.

中文翻译：

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浙江长兴地区早三叠世微生物岩

微生物群常被认为是海洋极端环境的信号，常见于华南下三叠统地层，在二叠纪末大灭绝后大量繁殖。已知早三叠世微生物岩相在古地理上有所不同，这可能是由于不同的气候、海洋化学和水深。本文首次记录了浙江省（华南东部）长兴地区潘家庄剖面二叠纪末大灭绝后微生物岩的短暂而壮观的发展。此处，上二叠统长兴组为典型的富含钙质藻类和有孔虫的浅台地相，其发育因二叠纪末大海退而终止。一个 3。4 米厚的微生物岩在最早的三叠纪海侵开始时开始形成。潘家庄剖面微生物岩由凝块石组成，含有丰富的钙化蓝藻、小腹足动物、微海螺管和介形动物，代表了二叠纪末危机后低多样性的浅海海洋群落。微生物岩继承了带有薄壳双壳类动物的薄层泥晶岩，它们记录了早三叠世海平面的快速上升。在微生物岩的上部和上覆的薄层泥晶中观察到大量的小黄铁矿小柱状体，表明当时形成了缺氧水条件。