Curr 10 mafic rocks: a potential source of rare-earth elements

Curr 10 mafic refers to the current state or condition of the tenth mafic rock. Mafic rocks are characterized by their high content of magnesium and iron, as well as their low silica content. They are usually dark in color, ranging from black to dark gray. The tenth mafic rock in question is part of a larger collection or study of mafic rocks. Its current state refers to its physical, chemical, and mineralogical properties at a specific point in time. It is important to study these rocks to better understand processes such as volcanic eruptions and the formation of igneous rocks.

Geological Studies in the Klamath Mountains Province, California and Oregon: A volume in honor of William P. Irwin

Previous detailed studies on a limited number of mafic intrusions demonstrate that they formed penecontemporaneously with the felsic batholith, but there is a need for a broader survey of mafic plutons using modern geochronological techniques. , non-cumulate mafic samples suggest that the crustal thickness of the Sierra Nevada batholith was roughly 30 km in the Early Jurassic and increased to 44 km by the Late Cretaceous.

It is important to study these rocks to better understand processes such as volcanic eruptions and the formation of igneous rocks. To determine the current state of the tenth mafic rock, several analyses and tests may be conducted. These could include petrographic analysis, which involves the examination of thin sections of the rock under a microscope to identify minerals and their textures.

Mafic intrusions record mantle inputs and crustal thickness in the eastern Sierra Nevada batholith, California, USA

Madeline J. Lewis , Juliet R. Ryan-Davis , Claire E. Bucholz; Mafic intrusions record mantle inputs and crustal thickness in the eastern Sierra Nevada batholith, California, USA. GSA Bulletin 2023; doi: https://doi.org/10.1130/B36646.1

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Contributions of heat and/or mass from mafic magmas are commonly invoked in models of voluminous granodiorite and andesite generation in magmatic and volcanic arcs worldwide. However, mafic intrusions are a volumetrically minor component in most arc batholiths. This is the case in the Sierra Nevada batholith, California, USA, where gabbro and diorite plutons are smaller and less abundant than the granitoid suites that make up the bulk of the batholith. Here, we constrain the timing and geochemistry of mafic intrusions in the Sierra Nevada batholith to assess the role of these compositions in arc batholith construction. Previous detailed studies on a limited number of mafic intrusions demonstrate that they formed penecontemporaneously with the felsic batholith, but there is a need for a broader survey of mafic plutons using modern geochronological techniques. New U-Pb zircon ages for 13 gabbro to diorite plutons and geochemistry from 17 mafic intrusions in the eastern Sierra Nevada batholith document two main episodes of mafic magmatism in the eastern Sierra Nevada batholith, from 168 Ma to 145 Ma and from 100 Ma to 89 Ma. These episodes overlap with the ages of granitoid plutons in the eastern Sierra Nevada batholith, including the Late Jurassic Palisade Crest and Late Cretaceous John Muir intrusive suites, in addition to other felsic plutons dated in the eastern Sierra Nevada batholith. Non-primitive mineral compositions in the mafic bodies indicate that their parental magmas are the evolved products of mantle-derived basalts that first differentiated in the lower crust prior to ascent and crystallization in the upper crust. The presence of rocks with cumulate textures, as well as a wide range of bulk-rock compositions (SiO₂ wt% 38−64, Mg# 39−74), show that magmatic differentiation continued within each mafic body after intrusion into the upper crust. Sr/Y ratios in melt-like (i.e., non-cumulate) mafic samples suggest that the crustal thickness of the Sierra Nevada batholith was roughly 30 km in the Early Jurassic and increased to ∼44 km by the Late Cretaceous. Concomitant intrusion of mafic melts along with voluminous granitoid plutons supports mantle melting as a major contributor of heat and magmatic volumes to the crust during construction of the eastern Sierra Nevada batholith.

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Geological Studies in the Klamath Mountains Province, California and Oregon: A volume in honor of William P. Irwin

Geological Studies in the Klamath Mountains Province, California and Oregon: A volume in honor of William P. Irwin

Chemical analyses may also be performed to determine the composition of the rock. This can be done through techniques such as X-ray fluorescence (XRF), which can quantify the major and trace elemental concentrations in the rock. Additionally, isotopic analyses may be carried out to study the age and origin of the rock. This can be done using radiometric dating techniques, such as potassium-argon dating or uranium-lead dating. By studying the current state of mafic rocks like the tenth mafic, scientists can gain valuable insights into Earth's geologic history and processes. This knowledge is essential for understanding the formation of rocks and minerals, as well as the dynamics of our planet's interior. It also has practical applications in fields such as mining and the search for natural resources. Overall, the study of Curr 10 mafic is an important component of geology and earth science..

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The formation of Curr 10 mafic rocks and its relation to mantle dynamics