浅论多旋回构造理论对第四纪深部物理运动研究的推动  

PROMOTION OF THE TECTONIC THEORY OF POLYCYCLE TO THE STUDY OF QUATERNARY PERIOD DEEP PHYSICAL MOVEMENT

作　　者：杨科佑[1] 

机构地区：[1]中国科学院地球化学研究所

出　　处：《第四纪研究》1996年第3期272-276,共5页Quaternary Sciences

摘　　要：第四纪最突出的事件是青藏高原和南海海盆的形成和演化。众多中外学者几乎一致认为，青藏高原的形成是由于印度克拉通向北的推动，南海等西太平洋边缘海是在太平洋板块和菲律宾海板块向西俯冲的过程中形成的。笔者另辟蹊径，提出，由于新生代（尤其是第四纪）以来两个相互交切的东亚断裂和南亚断裂的深部物理运动，使得南海等西太平洋边缘海地区的陆壳物质被逐渐吸入地幔，经转化为“幔源壳质”以后，再不断输送、补充给青藏地区。其结果必然是，南海等西太平洋边缘海地区的陆壳迅速转化为过渡型壳甚至洋壳，青藏地区则由洋壳转化为陆壳，并迅速隆起、增厚。The most outstanding events were the formation and evolution of Qinghai-Xizang Plateau and South Sea basin in Quaternary period. Many home and abroad experts considered the basic reason subduction of Indian and Pacific Plate to Eurasian Plate, the dynamical mechanism of driving plate is mantle convection. However, the author considered that the plate or terrane hypothesis can not explain the formation of Qinghai-Xizang Plateau and South Sea basin after studying Asia hot-structure and the origin of South China granites and super large gold deposits.The fact that staurolite-bearing diamond crystal was found in Swaziland showed that the crustal materials can enter into the deep mantle and recycle to the crust. The discovery confirmed the author's suspect of many years. Continental crust materials of West Pacific marginal sea including South Sea had been fored to absorb by the mantle, and had been transported to Qinghai-Xizang region by convection since Cenozoic era (especially Quaternary period). Thus, West Pacific area was changed from continental crust to transitional crust and oceanic crust, but Qinghai-Xizang region was changed from oceanic crust to continental crust.Supposing that Qinghai-Xizang Plateau and South Sea basin are two different geotectonic unites in nature, their structural control in bigger scale and deeper level is the deep physical movement between intersected East Asia and South Asia faults since the late Mesozoic era.NNE East Asia fault is an earthquake belt, and also a diamond and polymetallic ore belt. Its southern part extends into South Sea, passing through Wuling mountain,Taihang mountain, Daxinganling, acrossing Far-East in Russia until the Arctic. The differential movement of fault had been accelerated, which was of three-grade uplift in west (mountainous region～Yungui Plateau～Qinghai-Xizang Plateau) and of three-grade subsidence in east (plain and basin～marginal sea～deep trench).South Asia fault cross Mediterranean in west(well-known mercury polymetallic ore belt), passing thro

关 键 词：多旋回 青藏高原 南海海盆 深部物理运动 第四纪 

分 类 号：P534.63[天文地球—第四纪地质学]