气候变化领域集成服务门户(CCPortal): The Alamos Metamorphic Complex; evidence of late Paleozoic collision between Laurentia and Gondwanan blocks in northwestern Mexico

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DOI	10.1007/s00531-019-01693-y
	The Alamos Metamorphic Complex; evidence of late Paleozoic collision between Laurentia and Gondwanan blocks in northwestern Mexico
	Vega-Granillo R.; Bourjac-de-Anda A.; Vidal-Solano J.R.; Araux-Sánchez E.
发表日期	2019
ISSN	14373254
起始页码	1013
结束页码	1027
卷号	108 期号:3
英文摘要	The Alamos Complex is a metamorphosed volcano-sedimentary sequence exposed south of the late Paleozoic Ouachita–Marathon–Sonora orogen in northwestern Mexico, which in turn, is regarded as a continuation of the Alleghenian–Variscan mountain chain. Mineral assemblages in metavolcanic rocks indicate greenschist facies metamorphism. Thermobarometric studies yield an average metamorphic temperature of 380 °C, whereas andalusite in metapelites indicates pressure less than 0.4 ± 0.05 GPa. The main deformation phase generated pervasive foliation, which in turn was isoclinal to close folded and a second axial planar cleavage was developed. Metavolcanic rocks of the Alamos Complex can be separated in two suites: (1) an anorogenic suite, similar to enriched middle ocean basalts (E-MORB) in the Tesia region, and (2) an orogenic suite, characteristic of volcanic-arc setting in the Mocuzari region. U–Pb detrital zircon geochronology of one sample from Tesia yielded a maximum depositional age averaging 395 ± 28 Ma. One sample from the Mocuzari region yielded a maximum depositional age averaging 1104 ± 24 Ma, with the largest peak at 1428. A clastic sequence correlated with the Middle Triassic–Lower Jurassic Barranca Group, nonconformably cover the Alamos Complex. The basal conglomerate of that group yields a maximum depositional age averaging 372 ± 23 Ma. Accordingly, the Alamos Complex must be in part deposited after the early Devonian time and before the Middle Triassic. The main sources of detritus for the complex are the Meso- and Paleoproterozoic rocks of southwestern Laurentia, whereas the main source of detritus for the Barranca Group is the Rio Fuerte Formation exposed ~ 100 km south of the study area. The metamorphic event is ascribed to the late Paleozoic collision of Gondwanan blocks against the southern margin of Laurentia. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Alleghenian orogeny; Detrital zircon geochronology; Paleozoic regional metamorphism; Pangea amalgamation; Volcanic rock geochemistry
语种	英语
scopus关键词	Alleghanian orogeny; detrital deposit; geochronology; Gondwana; igneous geochemistry; Laurentia; metamorphism; Paleozoic; Pangaea; volcanic rock; zircon; Mexico [North America]; Tesia
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147852
作者单位	Departamento de Geología, Universidad de Sonora, Rosales y Encinas s/n, Hermosillo, Sonora 83000, Mexico; Departamento de Ingeniería Civil y Minas, Universidad de Sonora, Rosales y Encinas s/n, Hermosillo, Sonora 83000, Mexico
推荐引用方式 GB/T 7714	Vega-Granillo R.,Bourjac-de-Anda A.,Vidal-Solano J.R.,et al. The Alamos Metamorphic Complex; evidence of late Paleozoic collision between Laurentia and Gondwanan blocks in northwestern Mexico[J],2019,108(3).
APA	Vega-Granillo R.,Bourjac-de-Anda A.,Vidal-Solano J.R.,&Araux-Sánchez E..(2019).The Alamos Metamorphic Complex; evidence of late Paleozoic collision between Laurentia and Gondwanan blocks in northwestern Mexico.International Journal of Earth Sciences,108(3).
MLA	Vega-Granillo R.,et al."The Alamos Metamorphic Complex; evidence of late Paleozoic collision between Laurentia and Gondwanan blocks in northwestern Mexico".International Journal of Earth Sciences 108.3(2019).