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A Note on the Geology of Some Brazilian Kimberlites

1984; University of Chicago Press; Volume: 92; Issue: 3 Linguagem: Inglês

10.1086/628864

1537-5269

Darcy P. Svisero, Henry O. A. Meyer, Nicolau Ladislau Erwin Haralyi, Yociteru Hasui,

Clay minerals and soil interactions

Recently several possible kimberlites have been discovered in Brazil, particularly in the states of Minas Gerais, Mato Grosso, Piaui, Santa Catarina, and Rondonia. The presence of alluvial diamonds and kimberlites in the Alto Paranaiba region of western Minas Gerais has resulted in this area being the most investigated. The magmatism here is related to the Alto Paranaiba uplift that developed in the late Cretaceous following reactivation of ancient regional fractures. Kimberlites in other Brazilian localities may be approximately synchronous with the activity in Alto Paranaiba. Associated with the kimberlitic diatremes, especially in the Minas Gerais region, are lamprophyric and other alkalic intrusions.