遥感技术在西藏班戈地区构造研究与找矿预测中的运用
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摘要
西藏班戈地区的遥感地质调查研究表明:该区发育菱形网结状构造;错那、东错、蓬错、巴木错呈明显的"多字形"斜列,应为统一应力场下形成的伸展断陷盆地,并受到后期右行活动破坏;在东卡错—东错菱形块体中央隆起内发现有较大规模的岩浆岩侵入,推测该隆起区下为一地幔热柱;由北向南出露有东巧蛇绿岩带、东错—蓬错蛇绿岩带、白拉—觉翁蛇绿岩带,蛇绿岩带呈断续条带状出露;通过遥感蚀变信息提取和野外踏勘发现了多处矿化露头和矿化蚀变带。
Investigation of remote sensing geology shows that rhombic anastomosing structure is developed and Cuona,Dongcuo,Pengcuo,Ba Mucuo are distributed in xi-type struoturd system en echelon in Bange area of Tibet.They should be extensional fault basins formed under the same stress field and exposed to later right lateral shear.Large magmatic body intruded in central dome of Dong Kacuo-Dong Cuo lozenge rhombic block suggesting that under the dome occurs a mantle plume.From north to south are exposed intermitently Dongqiao ophiolite,Dongcuo-Pengcuo ophiolite belt,Baila-Jueweng ophiolite and the ophiolite occura in belt.By means of extraction of remote sensing alteration information and field reconnaissance several mineralization and alteration occurrences were discovered.
Investigation of remote sensing geology shows that rhombic anastomosing structure is developed and Cuona,Dongcuo,Pengcuo,Ba Mucuo are distributed in xi-type struoturd system en echelon in Bange area of Tibet.They should be extensional fault basins formed under the same stress field and exposed to later right lateral shear.Large magmatic body intruded in central dome of Dong Kacuo-Dong Cuo lozenge rhombic block suggesting that under the dome occurs a mantle plume.From north to south are exposed intermitently Dongqiao ophiolite,Dongcuo-Pengcuo ophiolite belt,Baila-Jueweng ophiolite and the ophiolite occura in belt.By means of extraction of remote sensing alteration information and field reconnaissance several mineralization and alteration occurrences were discovered.
引文
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[2]许志琴,杨经绥,李海兵,等.造山的高原——青藏高原的地体拼合、碰撞造山及隆升机制[M].北京:地质出版社,2007.
[3]陈发景,汪新文,陈昭年.伸展断陷盆地分析[M].北京:地质出版社,2004:3-7.
[4]史仁灯.蛇绿岩研究进展、存在问题及思考[J].地质评论,2005,51(6):681-693.
[5]宁树正.西藏崩错地区新生代构造特征研究[J].高原地震,2006,18(4):24-30.
[6]吴中海,吴珍汉,胡道功,等.青藏铁路唐古拉山—拉萨段全新世控震断裂研究[J].地质通报,2006,25(12):1387-1401.
[7]Jonathan C Aitchison,Jason R Ali,Aileen M Davis.印度板块和亚洲大陆在何时何地碰撞[J].地质通报,2008,27(9):1351-1370.
[8]曹圣华,邓世权,肖志坚,等.班公湖怒江结合带西段中特提斯多岛弧构造演化[J].沉积与特提斯地质,2006,26(4):25-32.
[9]许志琴,杨经绥,戚学祥,等.印度/亚洲碰撞-南北向和东西向拆离构造与现代喜马拉雅造山机制再讨论[J].地质通报,2006,25(1-2):1-15.
[10]汪一鹏,沈军,王琪,等.川滇块体的侧向挤出问题[J].地学前缘,2003(S1):188-192.
[11]牛树银,李红阳,孙爱群,等.幔枝构造理论与找矿实践[M].北京:地震出版社,2002.
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