Volcanic sequence in Late Triassic - Jurassic siliciclastic and evaporitic rocks from Galeana, NE Mexico

被引:10
作者
Cruz-Gamez, E. M. [1 ]
Velasco-Tapia, F. [1 ]
Ramirez-Fernandez, J. A. [1 ]
Jenchen, U. [1 ]
Rodriguez-Saavedra, P. [1 ]
Rodriguez-Diaz, A. A. [2 ]
Iriondo, A. [3 ]
机构
[1] Univ Autonoma Nuevo Leon, Fac Ciencias Tierra, Carretera Linares,Cerro Prieto Km 8, Linares 67700, Nuevo Leon, Mexico
[2] Univ Nacl Autonoma Mexico, Inst Geofis, Ciudad Univ, Ciudad De Mexico 04510, DF, Mexico
[3] Univ Nacl Autonoma Mexico, Ctr Geociencias, Blvd Juriquilla 3001, Queretaro 76230, Queretaro, Mexico
关键词
Northeastern Mexico; Island arc; Continental arc; Late Triassic; Jurassic; GULF-OF-MEXICO; U-PB; NORTHEASTERN MEXICO; TRACE-ELEMENT; ISLAND ARCS; DISCRIMINATION; ZIRCON; GEOCHRONOLOGY; SUBDUCTION; EVOLUTION;
D O I
10.1344/GeologicaActa2017.15.2.2
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
In northeastern Mexico, volcanic rocks interbedded with Late Triassic-Jurassic siliciclastic and evaporitic strata have been linked to magmatic arcs developed in the Pangea western margin during its initial phase of fragmentation. This work provides new petrographic and geochemical data for volcanism included in the El Alamar and Minas Viejas formations outcropping in the Galeana region. Andesitic dykes and sills (n= 10) in the El Alamar redbeds show SiO2= 47.5-59.1% and MgO= 1.2-4.2%, as well as a geochemical affinity to island arc magmas. This work represents the first report of this tectonic setting in the region. Geological and petrographic evidence suggest that this arc system likely developed after similar to 220 and before similar to 193Ma. Trachy-andesitic and rhyodacitic domes (n= 20) associated with the Minas Viejas gypsum-carbonates sequence show SiO2= 61.8-82.7% and MgO= 0.1-4.0% with a tectonic affinity to continental arc. A rhyodacite sample from this region has been dated by U-Pb in zircon, yielding an age of 149.4 +/- 1.2Ma (n= 21), being the youngest age related to this arc. Finally, we propose a three step model to explain the tectonic evolution from Late Triassic island arc to Jurassic continental arc system in the northeastern Mexico.
引用
收藏
页码:89 / 106
页数:18
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