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首页> 外文期刊>Palaeogeography, Palaeoclimatology, Palaeoecology: An International Journal for the Geo-Sciences >A Permian-Triassic boundary microbialite deposit from the eastern Yangtze Platform (Jiangxi Province, South China): Geobiologic features, ecosystem composition and redox conditions
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A Permian-Triassic boundary microbialite deposit from the eastern Yangtze Platform (Jiangxi Province, South China): Geobiologic features, ecosystem composition and redox conditions

机译：来自长江东部（江西省，华南）的二叠系 - 三叠纪边界微生物矿床：地理学特征，生态系统成分和氧化还原条件

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AbstractA Permian-Triassic (P-Tr) boundary microbialite (PTB-microbialite) deposit occurs near Xiushui on the southern margin of the eastern Yangtze Platform, South China. This 2-m-thick microbialite overlies uppermost Permian bioclastic limestone with a 5-cm-thick oolite-like grainstone layer at the contact. This PTB-microbialite consists of lower thrombolite (1.5-m thick) and an upper dendrolite (0.5-m thick). The thrombolite interval is characterized by a clotted texture of reddish sparitic patches embedded in a gray micritic matrix, whereas the dendrolite texture consists of brownish sparitic patches embedded within a yellow micritic matrix. Abundant calcified microbes occur in both the thrombolite and the dendrolite, including 1) columnar and clustered fabrics, which are especially rich in the thrombolite, assigned as products ofGakhumellaor related microorganisms and 2) microspheroids, 40–60μm in diameter, with different interior structures. These calcimicrobes are considered to have played an important role in constructing the Xiushui PTB-microbialite. The demise of the microbialite was likely due to a sea-level fall during the early Griesbachian (lowermost Triassic), which resulted in a lowering of the wave base thereby destroying the microbialite frameworks and facilitating the deposition of winnowed skeletal grainstone. Metazoan community structures within the microbialite changed sharply across the end-Permian extinction horizon, which is placed at a sharp negative shift in δ13Ccarb. Quantitative analyses show that the Xiushui microbialite community is similar to that of Chongyang and C
机译：<！[cdata [ 抽象 南部Xiushui附近发生XIUHUI附近的PEX-TRIASSIC（P-TR）边界微生物（PTB-Microbalite）押金华南长江东部平台边缘。该2M厚的微生物矿石在接触处具有5厘米厚的鲕粒晶石层，覆盖最高的二叠膜生物旋气石灰石。该PTB-MicroGialite由低旋光栓（1.5米厚）和上部树突（0.5米厚）组成。溶栓间隔的特征在于嵌入在灰色微晶基质中的红霉菌斑的凝结纹理，而树突纹理由嵌入在黄色微米矩阵内的褐色清除物斑块组成。丰富的钙化微生物在血栓栓塞和树突，包括1）柱状和聚集织物中，这些织物尤其富含溶栓，分配为宫内节育会的产品：斜耳和斜体>或相关微生物和2）微球，直径为40-60μm，内部结构不同。这些钙纤维杆菌被认为在构建Xiushui PTB-Microbialite方面发挥了重要作用。 Microbialite的消亡可能是由于在早期的GISSBACHIAN（最低三叠系）期间的海平面下降，这导致波基的降低，从而破坏了微生物骨架并促进了所需骨架造粒石的沉积。 Microbialite内的Metazoan群落结构在终端二叠系灭火视野中急剧变化，其放置在Δ 13 c CARB 。定量分析表明，Xiushui微生物群落与崇阳和C相似

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