Abstract Determining the nature and age of 200-km-wide Chicxulub impact target rock is an essential step in advancing our understanding Maya Block basement. Few constraints exist for northern crust, specifically basement underlying 66 Ma, 200 km-wide structure. The International Ocean Discovery Program-International Continental Scientific Drilling Program Expedition 364 core recovered a continu...

Evolution of sedimentary basins took place in the Barmer, Jaisalmer and Bikaner regions during K-T (Cretaceous-Tertiary) time in western Rajasthan, India. These intra-cratonic rift basins developed under an extensional tectonic regime from early Jurassic to Tertiary time. Rift evolution resulted in alkaline magmatism at the rift margins. This magmatism is dated at 68.5 Ma and has been considere...

A review of gold and bearing base metals deposits in Chile, indicate the existence at least six different type ore deposits, most largely formed during Cenozoic with predominance Miocene. Mesozoic are common but less relevant regarding their size content. These hydrothermal genetically associated subduction related Andean arc magmatism. Due to its relationship episodic magmatism migrating eastw...

The Araçuaí and Ribeira orogens have been studied for decades, recently, these two were described as the Araçuaí–Ribeira Orogen System. Despite much work investigating this orogenic system, some issues, such connection between orogens, are still not fully understood. This aimed to present unpublished Lu-Hf data Santa Angélica Intrusive Complex (SAIC) host rocks that part of Rio Negro magmatic a...

One view of the metamorphic subduction system supposes that coupled deformation and prograde/metasomatic reaction between the chemically enriched slab and the depleted mantle wedge promotes the formation of complexly hybridized lithologies along the slab/mantle interface. This type of model is based upon direct observations of the structure and petrology of high-P/T metamorphic complexes (e.g.,...

JULY 2005, GSA TODAY ABSTRACT The subduction factory processes raw materials such as oceanic sediments and oceanic crust and manufactures magmas and continental crust as products. Aqueous fluids, which are extracted from oceanic raw materials via dehydration reactions during subduction, dissolve particular elements and overprint such elements onto the mantle wedge to generate chemically distinc...

The Yukon-Tanana terrane in Yukon, Canada, records Late Devonian (ca. 366–360 Ma) rifting and the onset of latest Devonian–Carboniferous arc back-arc magmatism 360–325 Northern Cordillera. Detrital zircon U-Pb Hf isotope analyses indicate that metasedimentary basement was sourced northwestern Laurentia. Sandstones successions generally have robust Devonian–Mississippian age peaks, their signatu...

Mantle wedge melting and the formation of hydrous mafic melts in collision orogenic belts have great significance for crustal related granitic magmatism, which can provide key messages about crustal–mantle interaction convergent margin. This paper reported Late-Triassic appinite (212 ± 2 Ma), is closely associated with granites. The large euhedral hornblende crystals indicate a water-rich featu...