摘要
Genetic type of basement granite from volcanic arc in the north of West Burma Block is S-type granites, which developed in volcanic arc of convergent plate margins. The results yield a group of weighted mean ^206pb/^238U ages at 102±0.81 Ma （MSWD=0.23）, which show similarity to 93.7±3.4 Ma in the northern part of sampling points and 105±2 Ma in the southern part of sampling points, indicating continuous development of volcanic arc in the north of West Burma Block and subsequent granitic intrusion of late Early Cretaceous. The apatite fission track age of the samples is 22.72±3 Ma, thermal history modeling reveals that the volcanic arc in the north of West Burma Block went through two main stages in the process of uplift-cooling since Cenozoic： rapid uplifting and cooling from Late Oligocene to Early Miocene （29±1 to 20±1 Ma） and slow uplifting and cooling since Early Pliocene （4.2±1 Ma）.
Genetic type of basement granite from volcanic arc in the north of West Burma Block is S-type granites, which developed in volcanic arc of convergent plate margins. The results yield a group of weighted mean ^206pb/^238U ages at 102±0.81 Ma （MSWD=0.23）, which show similarity to 93.7±3.4 Ma in the northern part of sampling points and 105±2 Ma in the southern part of sampling points, indicating continuous development of volcanic arc in the north of West Burma Block and subsequent granitic intrusion of late Early Cretaceous. The apatite fission track age of the samples is 22.72±3 Ma, thermal history modeling reveals that the volcanic arc in the north of West Burma Block went through two main stages in the process of uplift-cooling since Cenozoic： rapid uplifting and cooling from Late Oligocene to Early Miocene （29±1 to 20±1 Ma） and slow uplifting and cooling since Early Pliocene （4.2±1 Ma）.
基金
supported by the Major National Science and Technology Programs in the Twelfth Five-Year Plan Period(No. 2011ZX05030-002-003)
the Major National Science and Technology Programs in the Eleventh Five-Year Plan Period(No. 2008ZX05030-02-03-01)
the Open Research Fund of Key Laboratory of Tectonics and Petroleum Resources of Min-istry of Education, China (No. TPR-2011-07)
