Bodo Weber , C. Nayeli Chacón-Olivas , M. Daniela Tazzo-Rangel , Miguel Franco-Rubio , Reneé González-Guzmán , Felix E.D. Kaufmann , Dirk Frei
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引用次数: 0
摘要
本文阐明了墨西哥奇瓦瓦州Sierra de Cuervo中元古代变质岩的成因和构造背景,为北美Grenville造山带向西南伸展提供了新的证据。使用了几种地质年代学方法,包括LA-ICP-MS的U-Pb锆石定年和使用ID-TIMS的Sm-Nd等时技术。火成岩锆石域显示长英质火成岩原岩的结晶年龄在~ 1.38 Ga ~ ~ 1.33 Ga之间,为~ 1.42 b.yr。古老的继承锆石。全岩Sm-Nd同位素资料确定等时线为1.52±0.03 Ga,表明中元古代早期地壳发育。变质作用的时间受Sm-Nd浸出石榴石全岩等时线和U-Pb锆石日期(~ 1.06 ~ ~ 1.05 Ga)的限制。利用常规地温计和拟剖面模拟方法,对变质岩样品在6.4±1 kbar和520±20°C下的变质压力和温度条件进行了估算。研究结果将Cuervo山的前寒武纪岩石与Laurentian边缘上西德克萨斯隆起逆冲的变质岩联系起来。我们认为这一逆冲代表了未暴露的格伦维尔前缘的残余,奇瓦瓦和西德克萨斯变质基底具有同生岩浆活动的特征,并在格伦维尔造山运动期间从北美大陆中部的花岗岩-流纹岩省改造而来,可与加拿大格伦维尔省的低中压异地渥太华变质带相比较。
The southwesternmost piece of the Grenville Orogen in Laurentia – New U-Pb and Sm-Nd ages, and P-T estimates from the Sierra del Cuervo, Chihuahua, Mexico
This paper elucidates the origin and tectonic setting of Mesoproterozoic metaigneous rocks of the Sierra de Cuervo, Chihuahua, Mexico, providing new evidence for the southwestern extension of the Grenville Orogeny in North America. Several geochronological approaches were used, including U-Pb zircon dating by LA-ICP-MS and the Sm-Nd isochron technique, using ID-TIMS. Igneous zircon domains reveal crystallization ages for felsic igneous protoliths ranging from ∼ 1.38 Ga to ∼ 1.33 Ga, with ∼ 1.42 b.yr. old inherited zircon. Whole-rock Sm-Nd isotopic data define an isochron at 1.52 ± 0.03 Ga, suggesting crustal growth during the early Mesoproterozoic. The timing of metamorphism is constrained by Sm-Nd leached garnet-whole-rock isochrons and by U-Pb zircon dates between ∼ 1.06 and ∼ 1.05 Ga. Metamorphic pressure and temperature conditions were estimated from a metamafic rock sample at 6.4 ± 1 kbar and 520 ± 20 °C using conventional geothermobarometry and pseudosection modeling. The results contextualize the Precambrian rocks of the Sierra del Cuervo with metamorphic rocks of the West Texas Uplift thrust over the Laurentian margin. We propose that this thrust represents a remnant of the unexposed Grenville Front and that the Chihuahua and West Texas metamorphic basement is characterized by contemporaneous magmatism and reworked from the Granite-Rhyolite Province of the North American midcontinent during the Grenville Orogeny, comparable to the low-medium pressure allochthonous Ottawan metamorphic belt of the Grenville Province in Canada.
期刊介绍:
Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as:
(1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology;
(2) Geochronology and isotope and elemental geochemistry;
(3) Precambrian mineral deposits;
(4) Geophysical aspects of the early Earth and Precambrian terrains;
(5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes.
In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes.
Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.