The server is under maintenance between 08:00 to 12:00 (GMT+08:00), and please visit
later.
We apologize for any inconvenience caused
Petrology and Geochemistry of Intrusive Rocks in the Ga'erqiong-Galale Ore Concentration Area, Tibet and Their Geological Implications
Author(s): ZHANG Zhi, TANG Juxing, LI Zhijun, YANG Yi, HU Zhenghua, YAO Xiaofeng, SONG Junlong, CHEN Wei, WANG Hongxing
Pages: 676-
688
Year: 2013
Issue:
4
Journal: Geology and Exploration
Keyword: Gaerqiong-Galale ore concentration area; Geochemistry; Bangong-Nujiang belt; Tibet;
Abstract: 尕尔穷-嘎拉勒矿集区位于西藏班公湖-怒江成矿带西段,是该带上近年来取得重大勘查突破的矽卡岩(斑岩)型铜金矿集区,区内现已发现有尕尔穷及嘎拉勒两个矽卡岩型铜金矿床.区内侵入岩主要有GL(嘎拉勒)花岗闪长岩、GL花岗斑岩、GL闪长岩、GE(尕尔穷)花岗斑岩、GE石英闪长岩等燕山晚期中酸性侵入岩.地球化学特征显示,区内侵入岩SiO2含量在53.68%~80.78%之间,平均值为65.66%,Al2O3含量在8.51%~16.91%之间,A/CNK(铝饱和指数)在0.54 ~1.11之间,表明区内侵入岩为准铝质-弱过铝质钙碱性-高钾钙碱性岩石系列;微量元素及稀土元素地球化学特征显示,区内侵入岩相对富集大离子亲石元素Rb、Sr、Th,而亏损Ta、Nb、Hf、Zr、Yb、Ti等高场强元素,各岩石类型均具Nb、Ta、Ti负异常,其中GE花岗斑岩具有非常明显的亏损Sr和Ti的特征.岩石成因类型判别表明GE花岗斑岩为S型花岗岩,而其它岩类为Ⅰ型花岗岩,结合构造环境的判别,指示矿集区侵入岩形成于班公湖-怒江特提斯洋闭合后碰撞隆升阶段.
Citations
No citation information