Laramide造山运动期间北美科迪勒山脉南部喜马拉雅式地壳融化与分异:亚利桑那州Coyote山脉

IF 3.5 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Journal of Petrology Pub Date : 2023-10-09 DOI:10.1093/petrology/egad075
James B Chapman, Cody Pridmore, Kevin Chamberlain, Gordon Haxel, Mihai Ducea
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引用次数: 0

摘要

美国南部和墨西哥北部科迪勒拉地区在Laramide造山运动(约80-40 Ma)期间经历了地壳融化。熔融物的变质源并没有暴露在地表,然而,在整个地区都存在着非净质花岗岩,这为研究与这次造山运动相关的变质过程提供了机会。对美国亚利桑那州南部Coyote山岩心杂岩的潘德花岗岩进行了详细的地球化学和岩石年代学分析,表明其在62 ~ 42 Ma期间发生了进阶变质、熔融和熔融结晶作用。锆石中钛温度(ti -zr)与锆石REE浓度变化相关,表明在62 ~ 53 Ma期间发生了渐进式加热、矿物分解和熔体生成。在此期间,ti -zr从~650℃升高到850℃。在53 ~ 51 Ma期间,锆石年龄有明显的间隙,反映了变质和熔融作用的高峰时间,导致了锆石的溶蚀。年龄差距是几个地球化学时间趋势的拐点,表明结晶和冷却在之后的51-42 Ma期间占主导地位。支持这一解释的是锆石U/Th和Hf的增加,ti -zr的减少,锆石(Dy/Yb)n的增加,以及导致锆石(再)结晶的耦合溶解-再沉淀过程的结构证据。全岩REE、LILE及主要元素特征表明,潘德花岗岩在此时期经历了超前的分步结晶。高硅白云母±石榴石浅花岗岩脉与两云母花岗岩脉横切,代表了更进化的残余熔融成分。盘德花岗岩是由变质火成岩原岩(包括侏罗纪弧岩和元古代甲骨文花岗岩)的缺液熔融和黑云母脱水熔融作用形成的。最可能的熔融原因被解释为:1)高原环境下与地壳增厚相关的放射成因加热和等温线松弛;2)与拉拉amide大陆弧相关的热量和流体传递;3)与深部岩石圈变形相关的剪切和粘性加热。形成潘德花岗岩的特征和岩石学过程与喜马拉雅浅花岗带的侵入套非常相似,进一步支持了北美科迪勒拉浅花岗带与拉腊胺造山运动期间的一次主要造山热事件之间的联系。
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Himalayan-like crustal melting and differentiation in the southern North American Cordilleran anatectic belt during the Laramide orogeny: Coyote Mountains, Arizona
Abstract The southern U.S. and northern Mexican Cordillera experienced crustal melting during the Laramide orogeny (ca. 80-40 Ma). The metamorphic sources of melt are not exposed at the surface, however, anatectic granites are present throughout the region, providing an opportunity to investigate the metamorphic processes associated with this orogeny. A detailed geochemical and petrochronological analysis of the Pan Tak Granite from the Coyote Mountains core complex in southern Arizona suggests that prograde metamorphism, melting, and melt crystallization occurred here from 62-42 Ma. Ti-in-zircon temperatures (TTi-zr) correlate with changes in zircon REE concentrations and indicate prograde heating, mineral breakdown, and melt generation took place from 62-53 Ma. TTi-zr increases from ~650 to 850 °C during this interval. A prominent gap in zircon ages is observed from 53-51 Ma and is interpreted to reflect the timing of peak metamorphism and melting, which caused zircon dissolution. The age gap is an inflection point in several geochemical-temporal trends that suggest crystallization and cooling dominated afterward, from 51-42 Ma. Supporting this interpretation is an increase in zircon U/Th and Hf, a decrease in TTi-zr, increasing zircon (Dy/Yb)n, and textural evidence for coupled dissolution-reprecipitation processes that resulted in zircon (re)crystallization. In addition, whole rock REE, LILE, and major elements suggest that the Pan Tak Granite experienced advanced fractional crystallization during this time. High silica, muscovite ± garnet leucogranite dikes that crosscut two-mica granite represent more evolved, residual melt compositions. The Pan Tak Granite was formed by fluid-deficient melting and biotite dehydration melting of meta-igneous protoliths, including Jurassic arc rocks and the Proterozoic Oracle Granite. The most likely causes of melting are interpreted to be a combination of 1) radiogenic heating and relaxation of isotherms associated with crustal thickening under a plateau environment, 2) heat and fluid transfer related to the Laramide continental arc, and 3) shear and viscous heating related to the deformation of the deep lithosphere. The characteristics and petrologic processes that created the Pan Tak Granite are strikingly similar to intrusive suites in the Himalayan leucogranite belt and further support the association between the North American Cordilleran anatectic belt and a major orogenic and thermal event during the Laramide orogeny.
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来源期刊
Journal of Petrology
Journal of Petrology 地学-地球化学与地球物理
CiteScore
6.90
自引率
12.80%
发文量
117
审稿时长
12 months
期刊介绍: The Journal of Petrology provides an international forum for the publication of high quality research in the broad field of igneous and metamorphic petrology and petrogenesis. Papers published cover a vast range of topics in areas such as major element, trace element and isotope geochemistry and geochronology applied to petrogenesis; experimental petrology; processes of magma generation, differentiation and emplacement; quantitative studies of rock-forming minerals and their paragenesis; regional studies of igneous and meta morphic rocks which contribute to the solution of fundamental petrological problems; theoretical modelling of petrogenetic processes.
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