云南新元古代地史研究的新认识  

STUDY ON THE NEOPROTEROZOIC GEOHISTORY OF YUNNAN PROVINCE

作　　者：王泽传 赵茂春 赵思传 刘仕军 朱延浙 严城民[2] WANG Ze-chuan;ZHAO Mao-chun;ZHAO Si-chuan;LIU Shi-jun;ZHU Yan-zhe;YAN Cheng-min(Yunnan International Mining Company(LtcO,Kunming 550052;Regional Survey of Geology and Mineral Resources,Yunnan Bureau of Geology & Mineral Resources,Yuxi 653100)

机构地区：[1]云南地矿国际矿业股份有限公司,云南昆明650051 [2]云南省地矿局区域地质矿产调查大队,云南玉溪653100

出　　处：《地层学杂志》2019年第1期74-80,共7页Journal of Stratigraphy

基　　金：云南省地质勘查基金"云南省大和铁多金属矿普查"项目(项目编码K2013018)资助

摘　　要：较为系统地搜集了云南新元古代的地层、岩石、构造、矿产的相关资料,结合长期进行不同比例尺的区域地质矿产调查、固体矿产勘查形成的认识,从区域地质发展史的角度再度对云南新元古代的地史演化进行研究,得出5方面的新认识。即:1)三江造山带的新元古界包括公养河群(中下部)、勐统群、南坑河组,均为地层层序清楚的浅变质含碳酸盐砂泥质沉积,与中元古界澜沧岩群、巨甸岩群地层层序模糊的浅变质含中基性火山岩的砂泥质沉积构成明显差别; 2)三江造山带的新元古界仅发生轻微变质,变质作用强度带为绢云母—绿泥石带(明显低于中元古界),变质作用时期为早寒武世末期,为兴凯运动的表现形式之一; 3)上扬子陆块的新元古界中,陆良组属青白口系,澄江组、牛头山组属青白口系—南华系,南沱组属南华系,观音崖组、陡山沱组、灯影组(中下部)属震旦系; 4)据南沱组冰碛层与下伏澄江组砂岩的地质年代,造成二者呈微弱角度不整合接触的澄江运动应发生在南华纪早期; 5)华南陆块的新元古界包括屏边群、浪木桥组(下部),屏边群的冰筏沉积、浪木桥组的含磷沉积分别与上扬子陆块冰川沉积的南沱组、含磷地层灯影组中谊村段相对比。Based on the Neoproterozoic strata, magmatic rocks, metamorphism, structures, mineral resources,and multi-scale regional geological mapping and solid mineral resources exploration, the Neoproterozoic characteristics and geohistory in Yunnan Province can be summarized as follows. 1) Neoproterozoic strata in the Three-river Orogenic Belt consist of the lower and middle Gongyanghe Group(Z∈G), Mengtong Group(ZM), and Nankenghe Formation(Znk), which are composed of lightly metamorphosed carbonate-bearing sandy argillites. They are significantly different from the Mesoproterozoic Lancang Metamorphic Group(Pt2 L)and Judian Metamorphic Group(Pt2 J), which are composed of lightly metamorphosed intermediate-basic volcanic rocks and sandy argillites. 2) Neoproterozoic strata of the Three-river Orogenic Belt are slightly metamorphosed at the end of the early Cambrian Period, resulting from the Xingkai Tafrogeny and characterized by sericite-chlorite grade metamorphism. 3) Among the Neoproterozoic strata in the Upper Yangtze Landmass, the Chengjiang(Qbc) and Luliang Formations(Qbl) belong to the Qingbaikou System;the Niutoushan Formation(Pt3 nt) belongs to the Qingbaikou-Nanhuan System;the Nantuo Formation(Nhn)belongs to the Nanhuan System;the Guanyinya(Z1 g), Doushantuo(Z1 d), and lower-middle Dengying(Z∈d)Formations belong to the Sinian System, 4) The Chengjiang Movement caused the weak angular unconformity between the Nantuo Formation(Nhn) and the underlying sandstone of the Chengjiang Formation(Qbc). 5)Neoproterozoic strata in the South China Landmass consist of the Pingbian Group(Pt3 P) and lower Langmuqiao Formation(Z∈l). Ice rafting sediments of the Pingbian Group and phosphatic sediments of the Langmuqiao Formation can be correlated, respectively, with glacial deposits of the Nantuo Formation(Nhn)and phosphorites of the Zhongyicun Member(Z∈^Z) of the Dengying Formation in the Upper Yangtze Landmass.

关 键 词：岩石地层 地史 地层划分 区域变质作用 兴凯运动 澄江运动 新元古代 云南 

分 类 号：P534.3[天文地球—古生物学与地层学]