大地构造与成矿学
大地構造與成礦學
대지구조여성광학
GETECTONICA ET METALLOGENIA
2009年
4期
598-602
,共5页
黄波%梁华英%莫济海%谢应雯
黃波%樑華英%莫濟海%謝應雯
황파%량화영%막제해%사응문
锆石年龄%铜钼矿床%成矿时代
鋯石年齡%銅鉬礦床%成礦時代
고석년령%동목광상%성광시대
Zircon LA-ICP-MS U-Pb age%Jinping-Tongchang Cu-Mo deposit%monzogranite porphyry%Ailao Shan-Red River shear zone
金平铜厂铜钼矿床赋矿岩体位于哀牢山-金沙江新生代成矿带南端,红河走滑断裂西侧,赋矿岩体主要由二长花岗斑岩及二长花岗岩组成.岩体锆石阴极发光图(CL)环带构造发育,不同环带U-Pb年龄在误差范围内基本一致.锆石LA-ICP-MS U-Pb年结果表明赋矿岩体主要是35.1±0.3Ma形成的.含矿岩体形成与印度板块与欧亚板块碰撞产生的红河-哀牢山左行走滑断裂活动有关.
金平銅廠銅鉬礦床賦礦巖體位于哀牢山-金沙江新生代成礦帶南耑,紅河走滑斷裂西側,賦礦巖體主要由二長花崗斑巖及二長花崗巖組成.巖體鋯石陰極髮光圖(CL)環帶構造髮育,不同環帶U-Pb年齡在誤差範圍內基本一緻.鋯石LA-ICP-MS U-Pb年結果錶明賦礦巖體主要是35.1±0.3Ma形成的.含礦巖體形成與印度闆塊與歐亞闆塊踫撞產生的紅河-哀牢山左行走滑斷裂活動有關.
금평동엄동목광상부광암체위우애뢰산-금사강신생대성광대남단,홍하주활단렬서측,부광암체주요유이장화강반암급이장화강암조성.암체고석음겁발광도(CL)배대구조발육,불동배대U-Pb년령재오차범위내기본일치.고석LA-ICP-MS U-Pb년결과표명부광암체주요시35.1±0.3Ma형성적.함광암체형성여인도판괴여구아판괴팽당산생적홍하-애뢰산좌행주활단렬활동유관.
The Jinping-Tongchang Cu-Mo deposit located at the southwestern segment of the Ailao Shan-Red River shear zone,which is in the southern part of the Cenozoic metallogenic belt along the Ailao Shan-Red River shear and its north-em stretching zone in eastern Tibet. The Jinping-Tongchang ore-bearing porphyry is composed of monzogranite porphyries and monzonites. CL photos of the analyzed zircons from the Jinping-Tongchang porphyry are characterized by the well-developed oscillatory zoning, suggesting that the analyzed zircon grains are of magmatic origin. Zircon LA-ICP-MS U-Pb age of the ore-bearing porphyry is 35.1 ±0. 3Ma, with MSWD = 1. 88. Different zoning of the same zircon grain has similar U-Pb age within error. The zircon age of the Jinping-Tongchang ore-bearing porphyry is similar to those of the Machangqing porphyry copper deposit and potassic alkaline rocks along the Ailao Shan-Red River shear zone. It is concluded that the Jinping-Tongchang ore-bearing porphyry has genetic relation to the left-lateral movements of the Ailao Shan-Red River shear zone caused by the collision between the Indian and Asian plates.