西藏班戈-切里错地区早白垩世火山岩的时代确定及意义

详细信息

收稿日期: 2001-10-31

AGE AND SIGNIFICANCE OF VOLCANIC ROCK OF EARLY CRETACEOUS IN THE BAN GE-QIELICUO AREAA IN TIBET

Received Date: 31 October 2001

摘要: 对班戈-切里错地区广泛分布的去申拉组中酸性火山岩详细研究认为,去申拉组中酸性火山岩角度不整合于沙木罗组(J₃-K₁s)之上,被竟柱山组(K_2-3j)角度不整合覆盖,同时获126Ma(Rb-Sr)同位素年龄值,证实去申拉组火山岩时代为早白垩世(K₁),为同造山期火山岩。去申拉组火山岩的时代确定,并将其从东巧蛇绿岩中分离出来,为蛇绿岩进一步研究提供了依据;为班公错-怒江结合带中段早白垩世造山事件的确定提供了依据。
- 班公错-怒江结合带 /
- 去申拉组 /
- 火山岩 /
- 同造山期
Abstract: Our research results show that volcanic rock of Qushenla Formation is angular unconformity with Shamuluo Formation(J₃-K₁s),and it is covered in angular unconformity by Jingzhuoshang Formation(K_1-2j),and its age of Rb-Sr radisotope is 126Ma.All evidence above show that volcanic rock of Qushenla Formation is syntectonic volcanic rock.As time is determined for volcanic rock of Qushenla Formation, it should separate out from Dongqiao ophiolite,it will put out new data for going deep into the research of the ophiolite,and it also should provide the evidence for orogenic event of Early Cretaceous in the Bangongcuo-Nujiang combine zone.
- Bangongcuo-Nujiang combine zone /
- Qushenla Formation /
- volcanic rock /
- synorogenic period