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首页> 外文期刊>Geochemistry, geophysics, geosystems >The North America mid-Cretaceous kimberlite corridor: Wet, edge-driven decompression melting of an OIB-type deep mantle source
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The North America mid-Cretaceous kimberlite corridor: Wet, edge-driven decompression melting of an OIB-type deep mantle source

机译：北美中白垩纪金伯利岩走廊：湿，边缘驱动的减压熔化OIB型深层地幔源

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Thirty new high-precision U-Pb perovskite and zircon ages from kimberlites in central North America delineate a corridor of mid-Cretaceous (115-92 Ma) magmatism that extends approximate to 4000 km from Somerset Island in Arctic Canada through central Saskatchewan to Kansas, USA. The least contaminated whole rock Sr, Nd, and Hf isotopic data, coupled with Sr isotopic data from groundmass perovskite indicates an exceptionally limited range in Sr-Nd-Hf isotopic compositions, clustering at the low (Nd) end of the OIB array. These isotopic compositions are distinct from other studied North American kimberlites and point to a sublithospheric source region. This mid-Cretaceous kimberlite magmatism cannot be related to mantle plumes associated with the African or Pacific large low-shear wave velocity province (LLSVP). All three kimberlite fields are adjacent to strongly attenuated lithosphere at the edge of the North American craton. This facilitated edge-driven convection, a top-down driven processes that caused decompression melting of the transition zone or overlying asthenosphere. The inversion of ringwoodite and/or wadsleyite and release of H2O, with subsequent metasomatism and synchronous wet partial melting generates a hot CO2 and H2O-rich protokimberlite melt. Emplacement in the crust is controlled by local lithospheric factors; all three kimberlite fields have mid-Cretaceous age, reactivated major deep-seated structures that facilitated kimberlite melt transit through the lithosphere.
机译：三十新的高精度U-PB Perovskite和Zircon年龄来自中南部的Kimberlites界定了中白垩纪（115-92 mA）的走廊，距离萨默特岛距离萨斯喀彻省的萨默塞特岛（Somerset Island）延伸至4000公里，通过Saskatchewan至Kansas，美国。污染的整个岩石SR，Nd和HF同位素数据，与来自综合钙钛矿的Sr同位素数据相结合，表明SR-Nd-HF同位素组合物中的异常限制，在OIB阵列的低（Nd）末端的聚类。这些同位素组合物与其他学习的北美金伯利岩和指向副间源区不同。这种中白垩纪的金伯利岩岩浆岩石不能与与非洲或太平洋大型低剪切波速度省（LLSVP）相关的地幔羽毛有关。所有三个金伯拉特领域都毗邻北美克拉顿边缘的强衰减的岩石圈。这种便利的边缘驱动对流，一条自上而下的驱动过程，导致过渡区的减压熔化或覆盖近腔圈。 Hingwoodite和/或WadsleyITE和H 2 O释放的反转，随后的弥撒和同步湿式部分熔化产生热的CO 2和H 2 O的Protimberlite熔体。地壳的施加由当地岩石家庭因素控制;所有三个金伯拉特田都有中白垩纪时代，重新激动的主要深层结构，促进了岩土圈熔体过渡的岩石圈。

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