扬子壳块西缘地台型铜成矿作用——以云南段为例
|
摘要
扬子壳块西缘云南段在晚震旦世—三叠纪处于相对稳定的地台演化阶段,但局部地段的拉张裂陷作用至少在早奥陶世开始,断续延续到三叠纪。地台期的铜成矿作用主要与初定期海浸沉积的碳酸盐岩、砂砾质碎屑岩建造和余定期台地边缘裂陷或拗陷带的碎屑岩建造、火山岩建造有关。地台阶段晚期逐渐积聚的地幔热能致使局部地段拉张裂陷,并引发基性岩浆喷出或侵入,使初定期以沉积型为主的成矿作用转变为余定期的火山-沉积型或喷流-沉积型。矿床形成后受地洼期构造-岩浆活动的影响,或多或少地都遭受了热液作用的叠加或改造,使先成矿床发生一定程度的叠加富化或改造富化。
During Late Sinian-Triassic Epoch the Yunnan segment of the western margin of Yangtze crustobody remained at the relative stable platiform evolution stage.However,local pull apart-depression took place at least at Early Ordovician Epoch and extended intermittently to Triassic Period.Cu metallogeny at the platform period was mainly related to carbonate rock annd sandy conglomeratic clastic rock formation during transgression at the initial stable platform stage and clastic rock and volcanic formations in the marginal pull apart-depression trough of residual stable platform period.In the late platform period the gradually accumulated mantle heat energy resulted in local pull apart-depression and eruption and intrusion of basic magma and the sedimentary metallogeny of the initial stable platform period gave way to volcano-sedimentary or Sedex-sedimentary metallogeny of the residual stable platform period.After formation of the Cu deposits they were enriched more or less by succeeding tectonic-magmatic activity of Diwa stage.
During Late Sinian-Triassic Epoch the Yunnan segment of the western margin of Yangtze crustobody remained at the relative stable platiform evolution stage.However,local pull apart-depression took place at least at Early Ordovician Epoch and extended intermittently to Triassic Period.Cu metallogeny at the platform period was mainly related to carbonate rock annd sandy conglomeratic clastic rock formation during transgression at the initial stable platform stage and clastic rock and volcanic formations in the marginal pull apart-depression trough of residual stable platform period.In the late platform period the gradually accumulated mantle heat energy resulted in local pull apart-depression and eruption and intrusion of basic magma and the sedimentary metallogeny of the initial stable platform period gave way to volcano-sedimentary or Sedex-sedimentary metallogeny of the residual stable platform period.After formation of the Cu deposits they were enriched more or less by succeeding tectonic-magmatic activity of Diwa stage.
引文
[1]刘肇昌,李凡友,钟康惠,等.扬子地台西缘构造演化与成矿[M].成都:电子科技大学出版社,1996.
[2]张云湘,骆耀南,杨崇喜.攀古裂谷[M].北京:地质出版社,1988.
[3]吴学益,吴惠明,陈省芬.扬子地块西南缘区域成矿的大地构造背景和矿床形成的构造控制[J].矿物学报,1997,17(4):376-385.
[4]薛步高.云南陡山沱组含矿性及其找矿探讨[J].矿产与地质,2000,14(2):81-85.
[5]刘旭辉.玉溪地区震旦系陡山沱组沉积相、地层层序及其控矿意义[J].云南地质,1998,17(1):86-90.
[6]肖荣阁,葛文胜.云南华宁-峨山地区震旦系沉积岩铜矿床成因[J].矿床地质,1999,18(2):138-145.
[7]何毅特.云南丽江铜矿带地质特征[J].西南矿产地质,1989,3(1):1-8.
[8]何兆昆.浅析宝坪铜矿成矿地质条件[J].有色金属矿产与勘查,1999,18(6):435-438.
[9]蒙光志.麻栗坡杨万火山喷流沉积-热液改造型铜矿[J].云南地质,2003,22(1):89-96.
[10]秦德先,燕永锋,林幼斌,等.程海断裂带玄武岩及其成矿[J].有色金属矿产与勘查,1999,8(6):373-377.
[11]陈扬玉.滇东地区微量元素分布地球化学特征概述[J].云南地质,1985,4(3):247-259.
[12]陈国达,杨心宜.活化构造成矿学[M].长沙:湖南教育出版社,2003.
[2]张云湘,骆耀南,杨崇喜.攀古裂谷[M].北京:地质出版社,1988.
[3]吴学益,吴惠明,陈省芬.扬子地块西南缘区域成矿的大地构造背景和矿床形成的构造控制[J].矿物学报,1997,17(4):376-385.
[4]薛步高.云南陡山沱组含矿性及其找矿探讨[J].矿产与地质,2000,14(2):81-85.
[5]刘旭辉.玉溪地区震旦系陡山沱组沉积相、地层层序及其控矿意义[J].云南地质,1998,17(1):86-90.
[6]肖荣阁,葛文胜.云南华宁-峨山地区震旦系沉积岩铜矿床成因[J].矿床地质,1999,18(2):138-145.
[7]何毅特.云南丽江铜矿带地质特征[J].西南矿产地质,1989,3(1):1-8.
[8]何兆昆.浅析宝坪铜矿成矿地质条件[J].有色金属矿产与勘查,1999,18(6):435-438.
[9]蒙光志.麻栗坡杨万火山喷流沉积-热液改造型铜矿[J].云南地质,2003,22(1):89-96.
[10]秦德先,燕永锋,林幼斌,等.程海断裂带玄武岩及其成矿[J].有色金属矿产与勘查,1999,8(6):373-377.
[11]陈扬玉.滇东地区微量元素分布地球化学特征概述[J].云南地质,1985,4(3):247-259.
[12]陈国达,杨心宜.活化构造成矿学[M].长沙:湖南教育出版社,2003.
目录