Mantle sources and the highly variable role of continental lithosphere in basalt petrogenesis of the Kerguelen Plateau and Broken Ridge LIP : Results From ODP Leg 183
Mantle sources and the highly variable role of continental lithosphere in basalt petrogenesis of the Kerguelen Plateau and Broken Ridge LIP : Results From ODP Leg 183
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DOI：
10.1093/petrology/43.7.1177
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发表时间：
2002-07
影响因子：
3.9
通讯作者：
C. Neal;J. Mahoney;W. Chazey
中科院分区：
文献类型：
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作者：
C. Neal;J. Mahoney;W. Chazey
覆盖在厚厚的拉斑玄武岩熔岩堆上的熔岩拉斑玄武岩和大洋钻探计划（ODP）第183航次的目的是调查位于1142号站点组成的大火成岩省的起源和演化处的可能的岩屑存款（2号单元）顶部的卵石，其地球化学特征与Kerguelen高原和Broken Ridge的次要特征一致。在钻探的八个地点中，来自大陆物质的贡献。这一特征在玄武岩中是不存在的，从七个，五个在高原上，两个在其他单位从这两个网站，其中有海洋岛屿般的破碎岭。我们目前的结果，从这些网站，1136，不兼容的元素比和年龄校正的同位素特征1138，1141和1142。虽然这个大的火成岩省是类似的（但不完全相同）后30马被解释为来自凯尔盖朗地幔柱，凯尔盖朗地幔柱。这些碱性玄武岩可能是该省部分地区迄今发现的最纯净的玄武岩再地球化学特征，表明其对大陆岩石圈的作用。118-119马玄武岩流恢复南部Kerguelen高原（站点1136）有一个更微妙的大陆签名比玄武岩在腿119站点738。100-101 Ma没有大陆特征
melts that overlies a thick tholeiitic lava pile. The tholeiite and Ocean Drilling Program (ODP) Leg 183 was designed to investigate pebbles from the top of a probable talus deposit (Unit 2) at the origin and evolution of the large igneous province composed of Site 1142 have geochemical signatures consistent with a minor the Kerguelen Plateau and Broken Ridge. Of the eight sites drilled, contribution from continental material. This signature is absent in basalt was recovered from seven, five on the plateau and two on the other units from these two sites, which have ocean-island-like Broken Ridge. We present results from four of these sites, 1136, incompatible element ratios and age-corrected isotopic characteristics 1138, 1141 and 1142. Although this large igneous province is similar (but not identical) to those proposed for the post-30 Ma interpreted as being derived from the Kerguelen mantle plume, the Kerguelen plume. These alkalic basalts may be the purest repgeochemical characteristics of basalt from some parts of the province resentatives of the Cretaceous plume tail composition yet found. indicate a role for continental lithosphere. The 118–119 Ma basalt flows recovered in the Southern Kerguelen Plateau (Site 1136) have a more subtle continental signature than shown by basalt at Leg 119 Site 738. A continental signature is absent in the 100–101 Ma