Early Mesoproterozoic inliers in the Chiapas Massif Complex of southern Mexico: Implications on Oaxaquia-Amazonia-Baltica configuration

被引:10
作者
Tatiana Valencia-Morales, Yuly [1 ]
Weber, Bodo [1 ]
Daniela Tazzo-Rangel, Maria [1 ]
Gonzalez-Guzman, Renee [1 ]
Frei, Dirk [2 ]
Andres Quintana-Delgado, Juan [1 ]
Nathanael Rivera-Moreno, Eli [1 ]
机构
[1] Ctr Invest Cient & Educ Super Ensenada CICESE, Dept Geol, Carr Ensenada Tijuana 3918, Ensenada 22860, Baja California, Mexico
[2] Univ Western Cape, Dept Earth Sci, ZA-7535 Bellville, Western Cape, South Africa
关键词
Chiapas Massif Complex; U-Pb geochronology; Sm-Nd isotopes; Rodinia; Mexican Proterozoic basement; U-PB GEOCHRONOLOGY; NORTHERN OAXACAN COMPLEX; ND ISOTOPIC DATA; GULF-OF-MEXICO; SM-ND; LU-HF; MAYA BLOCK; ZIRCON GEOCHRONOLOGY; TECTONIC EVOLUTION; CRUSTAL EVOLUTION;
D O I
10.1016/j.precamres.2022.106611
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
In this contribution, zircon U-Pb geochronology by LA-ICPMS and Sm-Nd isotope systematics by TIMS are reported on metaigneous rocks from the central Chiapas Massif Complex (CMC), southern Mexico. The data reveal the existence of a Paleo- to early Mesoproterozoic crust that differs significantly from surrounding units and from typical Precambrian basement of Oaxaquia. On the basis of Sm-Nd depleted mantle model ages (TDM(Nd)) between 2.0 and 1.8 Ga a distinct crustal slice within the CMC is defined and named the Catarina Unit. It comprises banded felsic and mafic orthogneiss (amphibolite) yielding Calymmian U-Pb zircon ages, corresponding to igneous protolith crystallization between similar to 1.58 and similar to 1.50 Ga. Inherited zircon cores with Pb-207/Pb-206 apparent ages between similar to 1.85 and similar to 1.70 Ga and whole rock epsilon Nd-(1.55Ga) values between + 1.2 and - 0.7 in granitic protoliths further suggest reworking of an older crustal component. Similarly, amphibolite has initial epsilon Nd-(1.50Ga) ranging from + 2.8 to - 0.5, indicating only minor depleted mantle additions during the formation the mafic protoliths. Zircon overgrowths document a major Tonian thermotectonic event at similar to 0.96-0.94 Ga that caused anatexis of Calymmian protoliths and intrusion of granitic melts (now biotite-amphibole quartz-feldspathic gneiss). Finally, all rocks underwent Permian-Triassic metamorphism and ductile deformation, commonly observed in the CMC. These results are interpreted in terms of an accretionary active margin established along the border of Amazonia in Calymmian times, where Catarina Unit protoliths formed by mixing of mantle-derived magmas with reworked cratonic crust. In Stenian times (1.2-1.1 Ga), the juvenile Oaxaquia arc accreted to the cratonic margin, followed by the collision between Amazonia and Baltica during final Rodinia amalgamation at similar to 0.99 Ga. Subsequently, the newly formed orogen entered into a period of uplift, gravitational collapse, and relaxation similar to the Dalane phase in Baltica, leading to mantle upwelling and anatexis of the Catarina Unit at 0.96-0.94 Ga.
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页数:25
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