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RADIOLARIAN BIOSTRATIGRAPHIC EVIDENCE FOR A LATE JURASSIC AGE OF THE EL TAMBOR GROUP OPHIOLITES (GUATEMALA)

机译:El Tambor群蛇卵石(危地马拉)的侏罗纪晚期的放射虫生物地层学证据

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摘要

We present a radiolarian biostratigraphic study of the metacherts of the El Tambor Group ophiolites (South Motagua Unit), Guatemala. The ophiolite sequence comprises MOR pillow metabasalts, massive metabasalts, metacherts and micaschists. The age of the studied metacherts is referable to the Late Jurassic (Oxfordian - Kimmeridgian). The radiolarian assemblage described in this paper is the first Jurassic finding in the ophiolitic MOR succession of the Motagua zone and represents a valuable tool to constrain the geodynamic evolution of the Caribbean area. A review of the ages of Jurassic rocks associated with the ophiolites from the Caribbean area is also reported.
机译:我们介绍了危地马拉El Tambor组蛇绿岩(南Motagua单元)的cher石的放射线虫生物地层学研究。蛇绿岩层序包括MOR枕形玄武岩,块状玄武岩,阶石和云母。被研究的软cher的年龄可参考侏罗纪晚期(牛津-基默尼第纪)。本文所述的放射虫组合是在Motagua地区的滑石MOR演替中的第一个侏罗纪发现,并且是限制加勒比地区地球动力学演化的有价值的工具。还报道了与加勒比海地区蛇绿岩有关的侏罗纪岩石年龄的回顾。

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