CAJ | 학술논문

以项目组近年来在青海取得的年龄研究成果为基础，通过对搜集到的1346个火成岩同位素年龄数据分布特征与地质演化过程对比研究，得到以下结论：①青白口纪热事件峰值特征暗示，青藏高原东北部地区在中元古代末有可能已经拉开了原特提斯洋演化的序幕。②在古特提斯演化过程中，岩浆活动相对于构造运动表现出一定的滞后性，这种滞后性在整个青藏高原东北部具有普遍性。③华力西-印支期构造演化旋回并不连续，中间可能有间断，并且间断可能发生于晚二叠世-早三叠世之间。④种种迹象表明，东昆仑地区泥盆纪处于持续强烈的伸展阶段，伴有大量具有伸展特性的基性岩以及 A 型花岗岩产出，该阶段从406 Ma 开始，结束时间不早于380 Ma。
이항목조근년래재청해취득적년령연구성과위기출，통과대수집도적1346개화성암동위소년령수거분포특정여지질연화과정대비연구，득도이하결론：①청백구기열사건봉치특정암시，청장고원동북부지구재중원고대말유가능이경랍개료원특제사양연화적서막。②재고특제사연화과정중，암장활동상대우구조운동표현출일정적체후성，저충체후성재정개청장고원동북부구유보편성。③화력서-인지기구조연화선회병불련속，중간가능유간단，병차간단가능발생우만이첩세-조삼첩세지간。④충충적상표명，동곤륜지구니분기처우지속강렬적신전계단，반유대량구유신전특성적기성암이급 A 형화강암산출，해계단종406 Ma 개시，결속시간불조우380 Ma。
Based on the age results the project team have gained in recent years,a comparative study is conducted on igneous rocks in terms of distribution and geological evolution of 1346 isotopic ages collected,and conclusions are drawn as follows (1)The peak value of Qingbaikou series thermal event indicates that Proto-Tethys evolution began in the end of Mesoproterozoic Era in Northeastern Margin of the Tibetan Plateau;(2)Magmatism presents a hysteretic nature compared with tectonic movement in the evolution of Paleo-Tethys evolution,which is rather common in the whole Northeastern Margin of the Tibetan Plateau;(3)The Variscan-Indosinian tectonic evolution cycle is not continuous,specifically,interruptions may take place during the late Permian to Early Triassic;(4)All the phenomenon show that East Kunlun Devonian is in a continuous strong extension period,with a large number of elastic basic rock and A-type granite occurrence,which began from 406Ma and ended no early than 380Ma.