气候变化领域集成服务门户(CCPortal): Early Tertiary extensional magmatism in southern Mexico and its relationship to exhumation of the Xolapa complex and detachment of the Chortis block

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DOI	10.1130/B31698.1
	Early Tertiary extensional magmatism in southern Mexico and its relationship to exhumation of the Xolapa complex and detachment of the Chortis block
	Mendoza O.T.; Ruiz J.; Duque L.R.D.; Souto S.A.S.; Hernández A.T.; Díaz J.L.G.; Villagrana A.S.
发表日期	2018
ISSN	167606
起始页码	796
结束页码	810
卷号	130 期号:2021-05-06
英文摘要	The Xolapa complex of southern Mexico is a crustal block, the age and nature of which are still unresolved. Its origin and tectonic evolution enclose critical clues about the geodynamic evolution of southern Mexico and the detachment and translation of the Chortis block of Central America and, hence, about the evolution of southern North America at the end of Mesozoic and the genesis of the Caribbean plate. To gain insights on these issues, detailed field observations, petrography, and whole-rock (major- and trace-element) geochemistry analyses, complemented with new geochronological (U-Pb and Ar-Ar) data, and whole-rock isotopic (Nd, Sr, Pb, and Os) determinations, were performed on deformed to undeformed plutons and dikes from the northern Xolapa complex. In addition to the Acapulco and Xaltianguis-Tierra Colorada magmatic events of ca. 54-50 Ma and 35-34 Ma, respectively, 10 distinctive magmatic pulses were recognized in the zone with ages ranging from ca. 61 Ma to ca. 32 Ma. Our geochronological data constrain the ages of the end of deformation and migmatization in the zone at ca. 60 Ma and ca. 55 Ma, respectively. Early Tertiary magmatism was dominantly mafic or felsic, and at least three bimodal magmatic suites were identified. Their geochemistry and isotopic compositions are compatible with emplacement in a continental back-arc or in a postcollisional, extensional setting and provide information on the participation of mantle and continental crust in magma genesis. Extension produced the exhumation of the northern Xolapa complex and the detachment and migration of the Chortis block at ca. 59 Ma. Extensional magmatism transitioned to a compressional regime related to subduction at the end of the Eocene. © 2017 Geological Society of America.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185028
作者单位	Unidad Académica Ciencias de la Tierra, Universidad Autónoma de Guerrero, Ex Hacienda San Juan Bautista s/n, Taxco el Viejo, Guerrero, 40323, Mexico; Department of Geosciences, University of Arizona, 1040 East 4th Street, Tucson, AZ 85721, United States; Instituto de Geología, Universidad Nacional Autónoma de México, Luis Donaldo Colosio esq. Madrid s/n, Hermosillo, Sonora, 83000, Mexico
推荐引用方式 GB/T 7714	Mendoza O.T.,Ruiz J.,Duque L.R.D.,et al. Early Tertiary extensional magmatism in southern Mexico and its relationship to exhumation of the Xolapa complex and detachment of the Chortis block[J],2018,130(2021-05-06).
APA	Mendoza O.T..,Ruiz J..,Duque L.R.D..,Souto S.A.S..,Hernández A.T..,...&Villagrana A.S..(2018).Early Tertiary extensional magmatism in southern Mexico and its relationship to exhumation of the Xolapa complex and detachment of the Chortis block.Bulletin of the Geological Society of America,130(2021-05-06).
MLA	Mendoza O.T.,et al."Early Tertiary extensional magmatism in southern Mexico and its relationship to exhumation of the Xolapa complex and detachment of the Chortis block".Bulletin of the Geological Society of America 130.2021-05-06(2018).