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The AAPG/Datapages Combined Publications Database
Pacific Section of AAPG
Abstract
Cenozoic Tectonism on Santa Cruz Island
Abstract
Santa Cruz Island is divided into two different geologic terranes by a westerly trending fault zone. Miocene volcanic rocks exposed on the north side dip homoclinally northward and are overlain by siliceous shale of the Monterey Formation. Strata exposed on the south side of the island include Paleogene fine-grained to conglomeratic marine sedimentary rocks, lower and middle Miocene breccia deposits, and middle Miocene volcaniclastic rocks. The composition and texture of these rocks suggest a complex and varying Cenozoic tectonic history. Several distinct tectonic episodes suggest that the south part of the island in pre-Miocene time was involved in northwest-oriented “basin-and-ridge” style tectonism that more recently has been replaced by east-west structures typical of the Transverse Range province.
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