摘要
扬子地台西缘江浪变质核杂岩体的基本结构,划分为堆垛层、褶叠层及板岩带等三个构造地层系统,其间为构造滑脱面所分割,在该类变质核杂岩体中发育有一个中间流变层。本文建立了堆垛层的新概念,认为它是造山带中深部地壳常见的基本构造型式。同时,阐述了该变质核杂岩体中铜矿的构造空间配置及构造过程对成矿作用的控制,建立了该杂岩体内铜矿的成穹-成矿模式,认为川西雅碧江流域地区有较好的找矿远景。
The Jianglang metamorphic core complex, a typical structure on the western margin of the Yangtze platform, is discussed in this paper. The exposed crust cross section there consists of three tectono-stratigraphic units, i. e. (1) ' stacking layer' , the upper part of the basement, consisting of the mid-Proterozoic mica-quartz schist sequence characterized by multiphase deformation and multiple trasposition of foliation; (2) 'folding layer' , the lower part of the cover, consisting of the Palaeozoic metasedimentary and metabasalt sequence, and (3) 'slate zone' , the upper part of the cover, consisting of the Triassic Xikang Group flysch sequence. There are detachment faults between any two adjoining sequences. It is emphasized that the folding layer represents a rheologic middle slab of the metamorphic core complex as reported in many metamorphic core complexes in China and abroad. A new concept, 'stacking layer' , is proposed and it is believed that this is a common and basic tectonic style in the middle-lower crust of orogenic belts. The structural control on the copper deposit in this area has been discussed, and a metallogenic model of copper deposits related to the formation of the metamorphic core complex has been proposed. It is believed that the Yalong River drainage area in western Sichuan province has a good prospect for copper deposits.
出处
《地质学报》
EI
CAS
CSCD
北大核心
1997年第2期113-122,共10页
Acta Geologica Sinica
基金
地质矿产部"八五"攻关项目(编号:85-01-005)
关键词
变持核杂岩
杂岩结构
铜矿床
成矿
层控矿床
metamorphic core complex, stacking layer, folding layer, Liwu copper deposit, tectono-stratabound ore deposit
