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滇东南个旧地区下三叠统卡房组的建立意义
The Significance of the Kafang Formation in Lower Triassic Series Would Be Established in Gejiu Area, Southeast Yunnan

DOI: 10.12677/AG.2020.102012, PP. 121-139

Keywords: 错时相灰岩沉积，糯谷寨剖面，卡房组，早三叠世Spathian阶，深水盆地，滇东南个旧地区
Anachronistic Facies Limestone Sediments, Nuoguzhai Profile, Kafang Formation, Early Triassic Spathian Stage, Deep-Water Basin, Gejiu Area of Southeastern Yunnan

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Abstract:

经过重新反复深入研究了滇东南个旧地区中三叠统个旧组一段(T2g1)，并将其从个旧组中分解出来，新建卡房组(T1k)，指定层型为卡房镇糯谷寨剖面，主要为巨厚的错时相沉积：扁平砾石灰岩、蠕虫状灰岩、微生物岩、薄－极薄层泥晶灰岩、条带状灰岩夹少量角砾状灰岩、流纹质凝灰岩，并且含丰富的垂直、斜交、平行层理的遗迹类化石，厚达1309.8 m。错时相沉积灰岩类型丰富，从卡房组底部至顶部多呈连续分布，含早三叠世腹足类：Polygyrina cf. sichaanensis Pa，与上覆中三叠世安尼阶个旧组薄层状白云岩化泥晶灰岩呈整合接触，与下伏早三叠世晚期Smithian阶含双壳类Eumorphotes cf. multifonmis薄层状粉砂质泥岩、粉砂岩呈整合接触，其时限为早三叠世Spathian阶，以夹特有的流纹质凝灰岩、臭味蠕虫状灰岩区别于国内报导的错时相沉积。迄今为止，是国内所发现的错时相沉积厚度规模最大、内容最丰富的唯一特例，真实重现了早三叠世错时相沉积从正常海洋环境沉积中退出并迁移到高压力下的缺氧的深水盆地环境。滇东南个旧地区属右江深水盆地的核心区域，早三叠世卡房组的建立不仅仅是提高了个旧组的研究精度，同时为深入研究右江盆地在三叠纪的生态系的复苏–辐射提供了丰富的资料。
The author has studied the first member of the Middle Triassic Gejiu Formation (T2g1) in Gejiu area of southeastern Yunnan repeatedly and thoroughly, and has decomposed it from the Gejiu Formation. Kafang Formation (T1k) was newly established, and the Nuoguzhai profile was appointed as a stratotype profile. The formation is mainly composed of very thick anachronistic facies sediments: flat-pebble limestone, vermicular limestone, microbialite, thin-very thin bedded micrite, banded limestone with a small amount of angle conglomeratic limestone and rhyolitic tuff, and rich in vertical, oblique, parallel bedding trace fossils, thickness reached 1309.8 m. There are abundant types of anachronistic facies sediment limestone, which distribute continuously from the bottom to the top of the Kafang Formation and containing the Early Triassic gastropods: Polygyrina cf. sichaanensis Pa. The Kafang Formation is conformable contact with the overlying thin-bedded dolomitized micrite of the upper Middle Triassic Gejiu Formation of the Anisian stage, and is conformable contact with the underlying thin-bedded silty mudstone, siltstone of the late Smithian stage which containing bivalve: Eumorphotes cf. Multifonmismis. The Early Triassic Spathian is the time limit of Kafang Formation. As the specific rhyolitic tuff and odor vermicular limestone as the difference of other anachronistic facies sediments that was reported domestically. So far, it is the only special case of the most thickness scale and the richest content anachronistic facies sediments that was found domestically. It recurred truly that the early Triassic anachronistic facies sediments withdrewfrom normal marine environment sediments, transferred to anoxic deep-water basin environment under high pressure. Gejiu area of southeastern Yunnan is the core area of Youjiang deep-water basin. The establishment of early Triassic Kafang Formation that is not only improves the research accuracy of Gejiu

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