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    雪峰陆内多期复合造山带震旦—三叠纪沉积演化特征

    Palaeozoic-Mesozoic sedimentary evolution characteristics of the Xuefeng Mountain intracontinental orogenic belt

    • 摘要: 提要:笔者通过对雪峰及其两侧震旦纪—三叠纪的地层沉积特征进行相关的野外调查和室内总结,基本明确了雪峰地区自震旦纪以来的隆凹变迁规律。根据雪峰地区的隆凹特征及古地理属性将雪峰地区震旦纪—三叠纪的构造沉积演化历程划分为五大阶段,分别为早震旦世—中奥陶世的斜坡-陆棚-盆地阶段;晚奥陶世—晚石炭世的隆起剥蚀阶段;二叠纪的碳酸盐岩台地阶段;早三叠世的碳酸盐质陆棚阶段和中三叠世—白垩纪的隆起—陆相山间盆地阶段。笔者从沉积角度证明雪峰的演化属性并非一个“古陆区”,而是一个多期复合叠加的陆内造山带。

       

      Abstract: Abstract:In this paper, the authors studied the characteristics of Palaeozoic-Mesozoic stratigraphic sedimentation in the Xuefeng Mountain and its lateral layers by means of field investigation and indoor analysis, and found out the regularity of uplifting-depression change in the Xuefeng Mountain since Palaeozoic. The course of tectono-sedimentary evolution from Palaeozoic to Mesozoic can be divided into five phases according to the features of uplifting-depression change and the palaeogeographic property in Xuefeng area, i.e., the phase of slope-continental shelf-basin from the earlier Sinian to the middle Ordovician, the phase of uplift denudation from the late Ordovician to the late Carboniferous, the phase of carbonate platform in the Permian period, the phase of carbonate continental shelf in the early Triassic and the phase of uplift to continental intermountain basin from the middle Triassic to the Cretaceous. The authors have confirmed that the Xuefeng’s evolution is characterized by a polyphase compounding folded intracontinental orogenic belt, rather than an “ancient land”.

       

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