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引用本文:邓晋福1 肖庆辉1,2 邱瑞照2 刘 翠1 赵国春1 于炳松1 周 肃1 钟长汀1 吴宗絮1. 华北地区新生代岩石圈伸展减薄的机制与过程[J]. 中国地质, 2006, 33(4): 751-761.
DENG Jin-fu1, XIAO Qing-hui1, QIU Rui-zhao2, LIU Cui1, ZHAO Guo-chun1, YU Bing-song1, ZHOU Su1, ZHONG Chang-ting1, WU Zong-xu1. Cenozoic lithospheric extension and thinning of North China:Mechanism and process[J]. Geology in China, 2006, 33(4): 751-761(in Chinese with English abstract).
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华北地区新生代岩石圈伸展减薄的机制与过程
邓晋福1 肖庆辉1,2 邱瑞照2 刘 翠1 赵国春1 于炳松1 周 肃1 钟长汀1 吴宗絮11,2
1. 中国地质大学地质过程与矿产资源国家重点实验室和岩石圈构造、深部过程及探测技术教育部重点实验室,北京 100083;2. 中国地质调查局发展研究中心,北京 100037
摘要:
提要:华北地区可划分出2个岩石圈尺度的构造单元:西面的鄂尔多斯克拉通块体和东部的华北裂谷盆地。华北裂谷由主体的似环状盆地和周边山岭组成,还有大的似环状盆地中央的苏鲁淮山岭。华北裂谷盆地,在古近纪(E)和新近纪(N)—第四纪(Q)时期分别通过主要的纯剪切(pure shearing)和分布剪切(distributed shesring)(均含简单剪切组分)变形机制形成,它们导源于软流圈上涌诱发的巨大岩石圈减薄作用。然而,鄂尔多斯块体周边的断陷盆地带则是通过简单剪切(simple shearing)变形机制形成,它们导源于鄂尔多斯克拉通块体的隆升和作用于鄂尔多斯南缘的六盘山与来自青藏高原碰撞带的北东向挤压力的联合作用。新生代时期,在快速的岩石圈大幅度减薄的时期内,华北地区东部向东伸展的速率比西部的鄂尔多斯块体大得多,它暗示软流圈物质向东的流动可能主动地拖拉着上覆岩石圈向东移动。可能有3条这样的通道,允许青藏碰撞带下面的软流圈物质向东流动,它们是:(a)高原南部过松潘—甘孜、三江达南海;(b)高原北部经六盘山、鄂尔多斯周边和华北—东北平原达日本海;(c)帕米尔经天山、蒙古西部、贝加尔达鄂霍次克海。
关键词:  华北  岩石圈伸展减薄  软流圈侧向流动和上涌  机制与过程
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Cenozoic lithospheric extension and thinning of North China:Mechanism and process
DENG Jin-fu1, XIAO Qing-hui1, QIU Rui-zhao2, LIU Cui1, ZHAO Guo-chun1, YU Bing-song1, ZHOU Su1, ZHONG Chang-ting1, WU Zong-xu11,2
1. Key Laboratory of Lithospheric Tectonics, Deep-level Process and Exploration of the Ministry of Education, China University of Geosciences, Beijing 100083, China;2. Development and Research Center, China Geological Survey, Beijing 100037, China
Abstract:
Abstract: Two lithospheric-scale tectonic units may be distinguished in North China: the circular North China rift and its surrounding mountain ranges in the east and the Ordos cratonic block and its surrounding elongated down-faulted basins in the west. The former consists of the main quasi-circular basins and surrounding ranges, as well as the mountain ranges in Jiangsu and Shandong in the central part of the large quasi-circular basin. The North China rift basins formed mainly by pure shearing and distributed shearing (both of which contain simple shear components) deformation mechanisms during the Paleogene and Neogene-Quaternary respectively. They originated by the combined action of the uplift of the Ordos cratonic block and NE-directed compression on the Liupan Mountains at the southern margin of Ordos from the Qinghai-Tibet Plateau collision zone. In the Cenozoic, during the rapid extensive lithospheric thinning, the rate of the E-directed extension in the eastern North China region was much higher than that in the Ordos block in the west, which implies that the eastward flow of the asthenospheric material may have actively dragged the overlying lithosphere eastward. There might be three passageways to allow the eastward flow of the asthenospheric material below the Qinghai-Tibet collision zone: (a) from the southern part of the plateau through Songpan-Garzê and Sanjiang (which refers to the Lancang, Nujiang and Jinsha rivers flowing in eastern Tibet, southwestern Sichuan and western Yunnan) to the South China Sea, (b) from the northern part of the plateau through the Liupan Mountains, peripheries of Ordos and Northeast China plain to the Sea of Japan, and (c) from Pamir through the Tianshan Mountains, western Mongolia and Baikal to the Okhotsk Sea.
Key words:  North China  lithospheric extension and thinning  asthenospheric lateral flow and upwelling, mechanism and process