Triassic rift-related sedimentary basins in northern Chile (24°-29°S)

M. Suarez, C. M. Bell

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

Triassic rocks in northern Chile (latitude 24°-29°S) include marine and continental rift-related sedimentary deposits, associated with basaltic, andesitic, and silicic volcanic rocks. Five main successions include the deposits of two marine basins (Profeta and San Félix) separated by three continental basins (Cifuncho, La Ternera, and La Coipa). The marine strata include turbidites and debris flow deposits interpreted as coarse-grained fan-delta sediments. The continental sediments include lacustrine fan delta, open lake, braided river, alluvial fan, and sabkha deposits. The widespread fan-delta systems (both marine and lacustrine), together with abrupt lateral and vertical facies discontinuities and large-scale depositional cycles, are indicative of rift-controlled sedimentation. The associated magmatic activity indicates that this rifting was the product of subduction-related extension or strike-slip movement on the active plate margin. Triassic rifting was followed in Late Triassic to Early Jurassic times by widespread thermotectonic subsidence.

Original languageEnglish
Pages (from-to)109-121
Number of pages13
JournalJournal of South American Earth Sciences
Volume6
Issue number3
DOIs
Publication statusPublished - 1992

ASJC Scopus subject areas

  • Geology
  • Earth-Surface Processes

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