Cenozoic plate tectonic reconstructions of SE Asia
Cenozoic plate tectonic reconstructions of SE Asia
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DOI：
10.1144/gsl.sp.1997.126.01.03
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
R. Hall
中科院分区：
文献类型：
--
作者：
R. Hall
本文综合了印尼东部记录菲律宾海板块运动的新古地磁资料、最近对南中国海历史的修正以及东南亚已有的地质和古地磁资料，提出了一个新的第三纪板块构造模型。新近纪早期婆罗洲的逆时针旋转被解释为关闭了一个原始的南中国海，暗示了新近纪之前婆罗洲西北部的走滑边界。这种旋转表明，西菲律宾海、西里伯斯海和马卡萨海峡形成了一个单一的盆地，该盆地在古近纪晚期开始开放，并向东加宽。大约25 Ma时，澳大利亚与菲律宾海板块弧发生了重大碰撞，圈闭了印度洋岩石圈，后来变成了摩鹿加海板块。碰撞导致菲律宾海板块顺时针旋转，启动了索隆断裂系统，然后通过东西两侧的俯冲消除了摩鹿加海。碰撞的影响通过该地区向西传播，导致了以区域不整合为标志的新的板块边界的开始。苏拉威西蛇绿岩于渐新世晚期与西苏拉威西发生碰撞，是苏拉威西与鸟头微大陆碰撞的最早事件。早中新世陆壳被冲到苏拉威西之下，图康别斯和苏拉地台从微大陆依次切开，几百万年后转移到西移的菲律宾海/摩鹿加海板块，最后向苏拉威西拼接。重建摩鹿加海和鸟头微大陆表明，班达海的大部分地区都有晚第三纪的伸展成因。菲律宾弧与台湾欧亚大陆边缘在约5 Ma时的碰撞是现今区域构造的关键。
Abstract A new plate tectonic model for the Tertiary is proposed, based on the integration of new palaeomagnetic data from east Indonesia recording Philippine Sea plate motion, recent revisions of the history of the South China Sea, and previously available geological and palaeomagnetic data from SE Asia. Early Neogene counter-clockwise rotation of Borneo is interpreted to have closed a proto-South China Sea suggesting a strike-slip boundary in NW Borneo before the Neogene. This rotation suggests that the West Philippine Sea, Celebes Sea and Makassar Strait formed a single basin which opened in the late Paleogene, and widened eastwards. At c. 25 Ma a major collision, that of Australia with a Philippine Sea plate arc, trapped Indian Ocean lithosphere which later became the Molucca Sea plate. The collision caused clockwise rotation of the Philippine Sea plate, initiated the Sorong Fault system, and then eliminated the Molucca Sea by subduction on its east and west sides. The effects of collision propagated westwards through the region resulting in the initiation of new plate boundaries marked by regional unconformities. The arrival of the Sulawesi ophiolite, which collided with west Sulawesi in the late Oligocene, was the earliest event in collision between Sulawesi and the Bird’s Head microcontinent. Continental crust was thrust beneath Sulawesi in the early Miocene, and the Tukang Besi and Sula platforms were sliced in turn from the microcontinent, transferred to the west-moving Philippine Sea/Molucca Sea plate for a few million years, and finally accreted to Sulawesi. Reconstructing the Molucca Sea and Bird’s Head microcontinent suggests that most of the Banda Sea has a late Neogene extensional origin. Collision between the Philippine arc and the Eurasian continental margin in Taiwan at c. 5 Ma is the key to present regional tectonics.