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| 长江中下游成矿带的幔根构造与深部找矿 | |
| 引用本文： | 真允庆,束乾安,戴宝章,汪莎,陈国衡,花林宝,丁梅花,郝红蕾.长江中下游成矿带的幔根构造与深部找矿[J].地质调查与研究,2009,32(2). |
| 作者姓名： | 真允庆 束乾安 戴宝章 汪莎 陈国衡 花林宝 丁梅花 郝红蕾 |
| 作者单位： | 1. 江苏省有色金属华东地质勘查局,南京,210093;江苏省有色金属华东地质勘查局814队,江苏镇江212005;中国冶金地质勘查工程总局三局,太原,030002 2. 江苏省有色金属华东地质勘查局,南京,210093;江苏省有色金属华东地质勘查局814队,江苏镇江212005 3. 南京大学地球科学系,南京,210007 4. 江苏省有色金属华东地质勘查局,南京,210093;南京大学地球科学系,南京,210007;江苏华东有色矿业发展有限公司,南京,210007 |
| 摘 要： | 长江中下游铁铜金多金属成矿带,正处于华北板块与扬子板块碰撞造山带的断裂构造部位.由于岩石圈大尺度不连续和地壳减薄无山根的成矿背景,促使燕山期热事件成为断裂-盆地-岩浆-成矿带的响应.区内Ⅰ型花岗岩是地幔基性岩浆底侵与壳幔相互作用的结果,包体研究和透明地震反射区资料证明它们具有软流圈上涌与下地壳拆沉作用的印记,也是幔根构造的源地.正因为透岩浆流体作用,形成大量金属矿床,因而这些矿床的成矿时代具有突发性和规律性,同时成矿物质来源具有多源性和不均匀性;成矿流体具有同一性和矿床类型的多样性;成矿期次具有叠加改造性.从S、Pb、Sr、H、O、C、Si、Cu等同位素组成取得的信息,也可作为幔根构造壳幔同熔成矿的佐证.按照幔根构造成矿机理分析,预测本区仍有第二成矿空间(-500～-2 000 m),建议以"类埃达克岩(体)"为中心的地区,可作为新一轮找矿的首选区.运用综合方法(遥感、磁、电、重、地震及深穿透地球化学等),以探明深部与下古生界碳酸盐岩的接触带为主攻目标,建立四维成矿模型,确定找矿靶区,尽快进行钻探验证. |
| 关 键 词： | 岩石圈大尺度不连续 地壳减薄 底侵、拆沉作用 幔根构造 铁、铜、金、多金属成矿带 长江中下游 |
Mantle Rooted Structure and Deep Ore Prospecting in the Middle and Lower Reaches of the Yangtze River |
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| ZHEN Yun-qing,SHU Qian-an,DAI Bao-zhang,WANG Sha,CHEN Guo-heng,HUA Lin-bao,DING Mei-hua,HAO Hong-lei.Mantle Rooted Structure and Deep Ore Prospecting in the Middle and Lower Reaches of the Yangtze River[J].Geological Survey and Research,2009,32(2). | |
| Authors: | ZHEN Yun-qing SHU Qian-an DAI Bao-zhang WANG Sha CHEN Guo-heng HUA Lin-bao DING Mei-hua HAO Hong-lei |
| Abstract: | The iron-copper-gold polymetallic metallogenetic belt of the middle and lower reaches of the Yangtze River is located in the fault structure of the collisional orogenic belt between North China Block and Yangtze Block.Because the lithosphere in a large-scale discontinuous and crustal thinning and no root of mountain mineralization background,the Yanshannian thermal event responsed for the fault-basin-magma-metallogenetic belt.I-type granites of this region were the results of the mantle-derived basic magma ... |
| Keywords: | Lithospheric large-scale uncontinuonus Crustal thinning Underplating and delamination Mantle-rooted structure Iron-copper-gold polymetallic metallogenetic belt Middle and lower reaches of the Yangze River |
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