Petrology, bulk-rock geochemistry, and perovskite U-Pb age for the P-12 kimberlite pipe from the Wajrakarur kimberlite field, Eastern Dharwar craton (EDC) of southern India is reported. Perovskites yielded a high-precision U-Pb age of 1122 ± 7.7 Ma, taken to be an emplacement age of the host P-12 kimberlite pipe. The groundmass of coherent facies P-12 kimberlite contains monticellite, clinopyroxene, andradite, atoll spinel with titanomagnetite trend, and perovskite with an elevated REE contents. Phlogopite shows restricted Al₂O₃ and TiO₂ contents. Furthermore, olivines with a wider and higher range of core compositions (i.e. Mg# = 84–94) and multi-granular nodules are the hallmark features of the P-12 pipe. This assorted primary mineral content and its composition indicates the transitional nature of the P-12 towards the Kaapvaal lamproites. However, concentrations of bulk-rock major and trace elements in the P-12 and other Wajrakarur kimberlites are similar to the global hypabyssal magmatic kimberlites. Large ion lithophile and high field strength elements (e.g. Ba and Nb) and their ratios (e.g. La/Nb and Th/Nb) suggest the presence of a heterogeneous and lithosphere influenced mantle source region which have been severely overprinted by metasomatizing fluids/melts emanating from the deep sourced upwelling mantle. The presence of such mixed and metasomatized mantle source regions likely to be an important factor for the transitional nature of the P-12 and other Mesoproterozoic kimberlites.

Based on the availability of the newest emplacement ages, we propose a geodynamic model for the origin of kimberlites in the Indian subcontinent. The U-Pb age of 1122 ± 7.7 Ma for the P-12 pipe shows its close temporal association to the emplacement of the recently proposed 1110 Ma Large Igneous Province (LIP), with plume center beneath the NW part of the Kalahari craton. Emplacement of the P-12 and other contemporaneous Indian kimberlites, therefore, marks the impingement of mantle plume which contributed heat and triggered partial melting of metasomatized lithospheric mantle without melt input. The eruption phase of ~ 100 million years (i.e. 1050–1153 Ma), for the kimberlites and related rocks in the Indian shield, does not appear to be continuous and can be separated into several short-durational magmatic events. For this reason, small-volume, volatile-rich magmatism during the Mesoproterozoic time in India is linked to the presence of a number of LIPs and associated mantle plumes during Columbia to Rodinia supercontinent transition and assembly of cratonic blocks of the latter.

据报道，来自印度南部东部Dharwar克拉通（EDC）Wajrakarur金伯利岩田的P-12金伯利岩管的岩石学，块岩地球化学和钙钛矿U-Pb年龄。钙钛矿的高精度U-Pb年龄为1122±7.7 Ma，被认为是宿主P-12金伯利岩烟斗的放置年龄。相干相P-12金伯利岩的地层中含有蒙脱石，斜辉石和红土，具有尖晶石磁铁矿的环礁尖晶石和稀土元素含量较高的钙钛矿。金云母显示受限的Al ₂ O ₃和TiO ₂内容。此外，P-12管道的标志性特征是橄榄石的芯组成范围更大，范围更广（即Mg＃= 84-94）和多颗粒结核。各种主要矿物质含量及其组成表明P-12向Kaapvaal褐铁矿的过渡性质。但是，P-12和其他Wajrakarur金伯利岩中的块状岩石主要元素和微量元素的浓度与全球海底岩浆岩性金伯利岩相似。较大的离子亲石性和高场强元素（例如Ba和Nb）及其比率（例如La / Nb和Th / Nb）表明存在受岩石圈影响的非均质地幔源区，这些源已被交代化的流体/熔体严重套印了来自深层上升流地幔。

根据最新安置年龄的可利用性，我们提出了印度次大陆金伯利岩成因的地球动力学模型。P-12管道的U-Pb年龄为1122±7.7 Ma，这与最近提议的1110 Ma大火成岩省（LIP）的位置具有密切的时间联系，羽状中心位于卡拉哈里克拉通西北侧。因此，P-12和其他同期印度金伯利岩的侵袭标志着地幔柱的撞击，该地幔柱贡献了热量并触发了交代岩石圈地幔的部分熔融，而没有熔融物的输入。印度盾构中的金伯利岩和相关岩石的喷发阶段约为1亿年（即1050–1153 Ma），似乎不是连续的，可以分为几个短时间的岩浆事件。因此，小批量，