摘要
钾长石MDD和磷灰石裂变径迹研究表明,西秦岭北缘地区存在2次区域性快速冷却事件,分别为约230～210MaB.P.和约 140～120Ma B.P。约230～210Ma B.P.的快速冷却事件可能反映西秦岭秦岭洋于印支期闭合,发生了大规模的岩浆侵入活动,以及随后造山带迅速褶皱、隆升事件;140～120Ma B.P.的快速冷却事件与西秦岭北缘断裂以北的白垩纪盆地发育的时间一致,可能与西秦岭北缘隆升,同时其以北地区形成巨大的盆地有直接的关系。同时,该事件与燕山运动主幕发生的时间一致,说明中燕山期我国东西部广大区域普遍存在一次构造运动。
Two regional rapid cooling events are revealed in west Qinling region by felspar Multiple Diffusion Domain (MDD)
method and appatite fission track method. They occurred at 230～210MaB. P. and 140～120MaB. P respectively. The event occurred
at 230～210MaB. P. may relate to the Qinling ocean closed and following magma invasion, mountain folding and uplifting. The event
occurred at 140～120MaB. P. is timely identical to the evolution of early Cretaceous basin which located north to the west Qinling
mountan. So it may directly related to the west Qinling uplifting and basing evolution at the same time. In addition, the event occurred
at 140～120MaB. P. identical to the main act of Yanshan event timely, it show that the Yanshan event may occurred at wide area in
china.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第3期697-706,共10页
Acta Petrologica Sinica
基金
国家自然科学基金(编号:402304040)
国家"973"项目(编号:2002CB412600)和国家自然科学基金(编号40202020
49825104)共同资助.
关键词
秦岭
MDD
裂变径迹
快速冷却事件
Qinling mountain
MDD
Fission track
Rapid cooling event
