HP–UHP Metamorphism and Tectonic Evolution of Orogenic Belts
CONTAINS OPEN ACCESS
High pressure (HP) and ultrahigh pressure (UHP) metamorphic rocks play a key role in understanding the tectonic evolution of orogenic belts. They have typically experienced complex changes during subduction and exhumation processes arising from recrystallization, deformation, fluid–rock interactions and even partial melting, and may therefore carry valuable records of evolving geodynamic systems in an orogenic belt. This special publication addresses the current work on HP–UHP metamorphism and its relation to the tectonic evolution of orogenic belts.
This special publication contains fifteen papers covering the important orogenic belts of the Himalaya, Dabie–Sulu, Tian Shan, North Qaidam and others that have been grouped into three parts: (I) new developments in the determination of metamorphic pressure–temperature (PT) conditions and their timing, (II) overview papers of well-known HP–UHP metamorphic belts and (III) research papers for some newly discovered HP–UHP belts.
Petrography, mineralogy and geochemistry of jadeite-rich artefacts from the Playa Grande excavation site, northern Hispaniola: evaluation of local provenance from the Río San Juan Complex
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Published:January 01, 2019
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CiteCitation
Hans-Peter Schertl, Walter V. Maresch, Sebastiaan Knippenberg, Andreas Hertwig, Adolfo López Belando, Reniel Rodríguez Ramos, Laura Speich, Corinne L. Hofman, 2019. "Petrography, mineralogy and geochemistry of jadeite-rich artefacts from the Playa Grande excavation site, northern Hispaniola: evaluation of local provenance from the Río San Juan Complex", HP–UHP Metamorphism and Tectonic Evolution of Orogenic Belts, Lifei Zhang, Zeming Zhang, Hans-Peter Schertl, Chunjing Wei
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Abstract
Many archaeological sites with jadeitite artefacts are known in the Caribbean region, but defining the source of the raw material is a major problem because of great mineralogical heterogeneity both in potential sources and in artefacts. The archaeological settlement site of Playa Grande on the northern coast of the Dominican Republic is particularly significant because it yielded evidence of on-site axe manufacture, and lies only 20–30 km NE of a recently discovered potential source area of serpentinite mélanges in the nearby Río San Juan Complex (RSJC). A suite of nine artefacts was chosen from a collection of over 100 excavated woodworking tools rich in jadeite, as well as two blueschist artefacts. Permission to perform destructive analysis allowed data on petrography, mineral chemistry and bulk-rock chemistry to be obtained. Seven of the nine artefacts are jadeitite sensu stricto (>90 vol% jadeite), which are identical to material known from the RSJC. Two artefacts are jadeite–lawsonite rocks. These and the two blueschists show only minor differences from corresponding rocks of the RSJC source. With this direct linking of source and site material, it is now possible to better define source discriminators for the Caribbean and to assess sampling bias.
- Antilles
- archaeological sites
- archaeology
- artifacts
- blueschist
- Caribbean region
- cathodoluminescence
- chain silicates
- chemical composition
- clinopyroxene
- Dominican Republic
- excavations
- garnet group
- glaucophane schist
- Greater Antilles
- Hispaniola
- jadeite
- jadeitite
- lawsonite
- melange
- metaigneous rocks
- metals
- metamorphic rocks
- metasomatic rocks
- microscope methods
- mineral assemblages
- mineral composition
- nesosilicates
- omphacite
- orthosilicates
- petrography
- provenance
- pyroxene group
- rare earths
- samples
- sampling
- schists
- serpentinite
- silicates
- sorosilicates
- trace elements
- West Indies
- Playa Grande
- Rio San Juan Complex