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全球岩石圈板块为什么会运移? 被引量:2
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作者 万天丰 尹延鸿 《自然杂志》 2019年第1期63-70,共8页
全球岩石圈板块运移的动力学机制,长期以来始终是一个议而不决的难题。地质演化历史的大量信息都埋藏在岩石圈内部,很少出露地表。然而,近2亿年来的地质信息出露比较多,资料也比较可靠,学者可对此问题进行探讨。根据全球中、新生代7次... 全球岩石圈板块运移的动力学机制,长期以来始终是一个议而不决的难题。地质演化历史的大量信息都埋藏在岩石圈内部,很少出露地表。然而,近2亿年来的地质信息出露比较多,资料也比较可靠,学者可对此问题进行探讨。根据全球中、新生代7次板块运动模式的变化,可以认为岩石圈板块的运动是由巨大的陨石撞击地球表层诱发的,而不是如流传很广的"地幔传送带模式"假说所认为的那样产生的。每隔3 300万年左右,地球都会随太阳系一起穿越一次星际物质较密集的银道面,引起引力场的巨变。引力场的改变使一些小行星改变其原来的运行轨道,从而导致地球表层受到来自陨石的不同角度的撞击,诱发地球岩石圈板块运动方向或模式的改变。 展开更多
关键词 岩石圈板块运移 地球动力学机制 巨大陨石撞击 银道面
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Paleozoic Tectono-Metallogeny in the Tianshan-Altay Region,Central Asia 被引量:6
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作者 wan tianfeng ZHAO Qingle wanG Qianqian 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第4期1120-1132,共13页
The research on Paleozoic tectonics and endogenic metallogeny in the Tianshan-Altay region of Central Asia is an important and significant project. The Altay region, as a collision zone of the Early Paleozoic (500-39... The research on Paleozoic tectonics and endogenic metallogeny in the Tianshan-Altay region of Central Asia is an important and significant project. The Altay region, as a collision zone of the Early Paleozoic (500-397 Ma), and the Tianshan region, as a collision zone of the early period in the Late Paleozoic (Late Devonian-Early Carboniferous, 385-323 Ma), are all the result of nearly N-S trending shortening and collision (according to recent magnetic orientation). In the Late Devonian-Early Carboniferous period (385-323 Ma), regional NW trending faults displayed features of dextral strike-slip motion in the Altay and Junggar regions. In the Tianshan region, nearly EW-trending regional faults are motions of the thrusts. However, in the Late Carboniferous-Early Permian period (323-260 Ma), influenced by the long-distance effect induced from the Ural collision zone, those areas suffered weaker eastward compression, the existing NW trending faults converted into sinistral strike-slip in the Altay and Junggar regions, and the existing nearly E-W trending faults transferred into dextral strike-slip faults in the Tianshan region. The Rocks of those regions in the Late Carboniferous-Early Permian period (323-260 Ma) were moderately ruptured to a certain tension-shear, and thus formed a number of world famous giant endogenic metal ore deposits in the Tianshan-Altay region. As to the Central Asian continent, the most powerful collision period may not coincide with the most favorable endogenic metallogenic period. It should be treated to "the orogenic metallogeny hypothesis" with caution in that region. 展开更多
关键词 tectonics endogenic metallogeny long distance effect Tianshan-Altay region
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Mesozoic-Cenozoic Tectonics of the Yellow Sea and Oil-Gas Exploration 被引量:4
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作者 wan tianfeng HAO Tianyao 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2010年第1期77-90,共14页
The purpose of the present study was to study the tectonics of the Yellow Sea. Although oilgas exploration has been undertaken for more than 30 years in the southern Yellow Sea, the exploration progress has achieved l... The purpose of the present study was to study the tectonics of the Yellow Sea. Although oilgas exploration has been undertaken for more than 30 years in the southern Yellow Sea, the exploration progress has achieved little. There are three tectonic periods with near N-S trending shortening and compression (260-200 Ma, 135-52 Ma and 23-0.78 Ma) and three tectonic periods with near E-W trending shortening and compression (200-135 Ma, 52--23 Ma and 0.78 Ma) at the Yellow Sea and adjacent areas during the Mesozoic and Cenozoic. The lndosinian tectonic period is the collision period between the Sino-Korean and Yangtze Plates, which formed the basic tectonic framework for the Yellow Sea area. There were strong intraplate deformations during the Yanshanian (200-135 Ma) and Sichuanian (135-52 Ma) periods with different tectonic models, which are also the main formation periods for endogenic metallic mineral deposits around the Yellow Sea. The three tectonic periods during the Cenozoic affect important influences for forming oil-gas reservoirs. The Eocene-Oligocene (52-23 Ma) is the main forming period for oil-gas sources. The Miocene-Early Pleistocene (23-0.78 Ma) was a period of favorable passage for oil-gas migration along NNE trending faults. Since the Middle Pleistocene (0.78 Ma) the NNE trending faults are closed and make good conditions for the reservation of oil-gas. The authors suggest that we pay more attention to the oil-gas exploration at the intersections between the NNE trending existing faults and Paleogene- Neogene systems in the southern Yellow Sea area. 展开更多
关键词 TECTONICS stress field oil-gas exploration MESOZOIC-CENOZOIC Yellow Sea
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The genesis of tectono-magmatism in eastern China 被引量:15
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作者 wan tianfeng ZHAO QingLe 《Science China Earth Sciences》 SCIE EI CAS 2012年第3期347-354,共8页
The tectono-magmatism in eastern China is a hotspot for the researches, and many hypotheses of that were discussed. There is a middle crust with solid, low velocity and high conductivity in eastern China, which is imp... The tectono-magmatism in eastern China is a hotspot for the researches, and many hypotheses of that were discussed. There is a middle crust with solid, low velocity and high conductivity in eastern China, which is impossible to form"convection magmatic layer". The subduction and compression of oceanic plate induced to the lateral pressure for the eastern China lithosphere in the condition of increasing pressure and decreasing temperature, it is also impossible to form an extensively melting magma layer. In South China, the granitic zone migrates from west to east, their evolution cannot be explained by plate subduction. The original magmatic reservoirs are controlled by main faults and spheres, which occurred the tectonic detachment and formed in the process of decreasing pressure and increasing temperature. The magma only originates in very small part of lithosphere. The tectono-magmatism and tectonic detachment of eastern China lithosphere during the Jurassic and the Cretaceous are concentrate mainly near the intersections between the regional faults and middle crust or the Moho discontinuity, and then magma intrudes or erupts along faults. The tectono-magmatism of Cenozoic originates near the intersections between the regional high-angle normal faults and the bottom of lithosphere. Obviously, the different penetration depth of faults induces a different kind of magmatism. 展开更多
关键词 TECTONO-MAGMATISM GENESIS migration of magmatic zone tectonic detachment decreasing pressure and increasingtemperature
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