中国东北始新世火山事件的一次重要间断及其后之成矿信息  

An important discontinuity of the Paleogene volcanic incidents in northeast China and their prospecting significance

作　　者：张俊影[1] 彭玉鲸[1] 刘杰 

机构地区：[1]吉林省区域地质矿产调查所,吉林长春130022 [2]吉林省磐石市地矿局,吉林磐石132300

出　　处：《吉林地质》2007年第4期1-7,共7页Jilin Geology

摘　　要：在中国东北地区始新世48～32Ma期间，每1Ma内至少发生一处或数处玄武岩浆喷发火山事件。K—Ar测年数据记录了其活动的存在。唯44～42Ma间，火山事件间隔时间超过1Ma，在全区该时段近60个测年数据未发现有43Ma±测年记录。此时，正是太平洋板块由48～43MaNNW向运动（7．1cm／a）到43～37Ma转向NW—NWW向运动（5．8cm／a）的转折时间，也是全球大洋板块第三增生时段（97～85Ma）新的增生构造全部停止活动的时间（50～45Ma）。东北大陆边缘从拉分一张裂的区域应力场转换为NW向的拉伸（或伸展）应力场。陆缘裂谷或叠加于其早期的拉分一张裂盆地之上，或出现新的裂谷盆地。形成了晚始新世石油、油页岩、煤等含矿岩系，并成为古近纪沉积盆地该类资源的主含矿层。During Paleogene period 48～ 32 Ma in northeast China, one or several at least basaltic magma eruption events occurred each 1Ma; it is verified by K - Ar chronometric age data. only 44～42 Ma, the interval time of volcanic event is more than near 60 chronometric age data, 43 Ma chronometric record in the study area is not discovered, this moment, the Pacific plate moves from NNW to NW-NWW, also it is a hinge time of the Pacific plate movement from NNW to NW to NWW. Northern China continental margin pull-pull-apart regional stress field converts into NW stretch （extension） stress field, the continental margin rift superimposed on the early pull-part basin or occurred a new rift basin, forming late Eocene epoch petroleum, oil shale, coal ore-bearing rock series and becoming a main ore-bearing strata of the Paleogene period sedimentary basin.

关 键 词：44Ma 42Ma 火山事件 石油 油页岩 煤 主含矿层 

分 类 号：P317.3[天文地球—固体地球物理学]