| 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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| 引用本文：彭勇民,姚鹏,李金高.2000.西藏甲马弧内盆地甲马矿区晚侏罗世海绵礁的发现[J].地球学报,21(3):328-333. |
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| 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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| 中文摘要:西藏甲马弧内盆地晚侏罗世海绵礁属于台地边缘礁，呈近EW向展布，延伸长达4～5km，宽约50m，建筑在叶巴期火山岩浆弧的正地形上。由北向南展示出礁坪相到礁核相再到礁前斜坡相的侧向演变。其中礁核相主要由海绵骨架岩、障积岩和粘结岩等构成。海绵礁可分为并进礁和中止礁2种类型，发育至少6套垂向上相互迭叠的礁旋回。研究表明，甲马矿区海绵礁形成的关键因素是海平面变化，其主体的发育与海平面相对上升同步。 |
| 中文关键词:海绵礁 礁旋回 并进礁 海平面 西藏 |
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| The Discovery of Late Jurassic Sponge Reef in the Jiama Ore District within Jiama Intra arc Basin, Tibet |
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| Abstract: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. |
| keywords:sponge reef reef cycle keep-up reef sea level Tibet |
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