锆石岩石年代学所记录的拉里酰胺大陆下壳的减薄和加热过程

IF 2.9 2区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
J. H. Cipar, A. J. Smye, J. M. Garber, J. R. Reimink, A. R. C. Kylander-Clark
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引用次数: 0

摘要

来自新墨西哥州格兰德河裂谷变质岩下地壳的锆石颗粒,保留了从拉拉曼压缩向始新世延伸过渡的变质记录。来自五块双辉石元成花岗岩异岩石的锆石 U-Pb 同位素和痕量元素浓度确定了不同的族群:较老的锆石核心(15-50 Ma),重稀土元素 (HREE) 贫乏,但钛元素丰富;较年轻的锆石边缘(3-15 Ma),HREE 升高,钛元素浓度较低。耦合相平衡和石榴石-熔体-锆石痕量元素分区计算表明,在拉氏造山运动末期压缩停止期间,较老的锆石核心平衡于厚(40千米)、热(800-900°C)、含石榴石的下地壳中。锆石边缘域在较低的压力下平衡,与下地壳变薄9千米相一致。热运动学计算表明,这些压力-温度-时间限制要求岩石圈地幔在区域新生代延伸之前和期间变薄。地幔岩石圈经过数千万年的对流侵蚀,可能受到法拉伦板块动力学的推动,为促进下地壳加热和延伸提供了机制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Thinning and Heating of Laramide Continental Lower Crust Recorded by Zircon Petrochronology

Thinning and Heating of Laramide Continental Lower Crust Recorded by Zircon Petrochronology

Zircon grains from the metasedimentary lower crust of the Rio Grande Rift, New Mexico, preserve a metamorphic record of the transition from Laramide compression to Eocene extension. Zircon U-Pb isotopes and trace-element concentrations from five two-pyroxene metaigneous granulite xenoliths define discrete populations: older zircon cores (∼15–50 Ma) that are depleted in heavy rare-earth elements (HREE) but Ti-rich, and younger zircon rims (∼3–15 Ma) with elevated HREE and lower Ti concentrations. Coupled phase equilibria and garnet-melt-zircon trace-element partitioning calculations show that the older zircon cores equilibrated in thick (>40 km), hot (800–900°C), garnet-bearing lower crust during the cessation of compression at the end of the Laramide orogeny. Zircon rim domains equilibrated at lower pressures, consistent with >9 km of thinning of the lower crust. Thermal-kinematic calculations show that these pressure-temperature-time constraints require thinning of the lithospheric mantle prior to and during regional Cenozoic extension. Convective erosion of the mantle lithosphere over tens of millions of years, possibly facilitated by dynamics of the Farallon slab, provides a mechanism to facilitate lower crustal heating and extension.

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来源期刊
Geochemistry Geophysics Geosystems
Geochemistry Geophysics Geosystems 地学-地球化学与地球物理
CiteScore
5.90
自引率
11.40%
发文量
252
审稿时长
1 months
期刊介绍: Geochemistry, Geophysics, Geosystems (G3) publishes research papers on Earth and planetary processes with a focus on understanding the Earth as a system. Observational, experimental, and theoretical investigations of the solid Earth, hydrosphere, atmosphere, biosphere, and solar system at all spatial and temporal scales are welcome. Articles should be of broad interest, and interdisciplinary approaches are encouraged. Areas of interest for this peer-reviewed journal include, but are not limited to: The physics and chemistry of the Earth, including its structure, composition, physical properties, dynamics, and evolution Principles and applications of geochemical proxies to studies of Earth history The physical properties, composition, and temporal evolution of the Earth''s major reservoirs and the coupling between them The dynamics of geochemical and biogeochemical cycles at all spatial and temporal scales Physical and cosmochemical constraints on the composition, origin, and evolution of the Earth and other terrestrial planets The chemistry and physics of solar system materials that are relevant to the formation, evolution, and current state of the Earth and the planets Advances in modeling, observation, and experimentation that are of widespread interest in the geosciences.
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