| 西藏甲马弧内盆地甲马矿区晚侏罗世海绵礁的发现 |
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| 关键词:sponge reef reef cycle keep-up reef sea level Tibet |
| 基金项目:西藏科委重点项目(990107)，国土资源部定向基金项目(97042) |
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| The Discovery of Late Jurassic Sponge Reef in the Jiama Ore District within Jiama Intra arc Basin, Tibet |
| The Jurassic sponge reef is a kind of platform marginal reef existent in Jiama intra arc basin of Tibet.Stretching in EW direction, it is 4～5 km in length and 50 m in width,lying on the early positive topography of the volcano-magmatic arc of Yeba Stage. It has evolved late-rally, showing reef flat, core and front from north to south. The reef core consists of sponge framestone, bafflestone and bindstone. The sponge reef can be divided into keep-up type and give-up type with the development of at least six vertically superimposed reef cycles. It turns out that the dey factor for the formation of sponge reef was sea level changes and that the growth of reef was in concord with relative eustasy rise. |
| PENG Yong-min,YAO Peng,LI Jin-gao.2000.The Discovery of Late Jurassic Sponge Reef in the Jiama Ore District within Jiama Intra arc Basin, Tibet[J].Acta Geoscientica Sinica,21(3):328-333. |
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