Geochemical evolution of Jurassic diorites from the Bristol Lake region, California, USA, and the role of assimilation

Article Abstract:

High-alumina basalts, hawaiite basalts, high-potassium arc andesites and late Jurassic dioritic plutons from the Bristol Lake region of the Mojave Desert possess high concentrations of potassium oxide, aluminum trioxide, zirconium/titanium dioxide, niobium and light rare earth elements. Assimilation and fractional crystallization of hornblende and plagioclase created the diorites from the Granite Mountains suite. Isotopic analyses of different plutons revealed that subcontinental lithospheric melting was a factor in the eastern Mojave desert intra-arc extension during the Jurassic.

Analysis, Igneous rocks

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Jurassic plutonism and crustal evolution in the central Mojave Desert, California

Article Abstract:

A study of rock types in central Mojave Desert in CA reveals the presence of a variety of plutonic rocks such as calc-alkaline gabbro and quartz monozonite and petrologic extensiveness in the region as a result of mixing crustal parts with mantle melts. Evidence of deficient mantle components in the central desert region in comparison to the mantle-rich southern region is an indication of a possible mantle boundary between the desert regions.

Natural history, Mojave Desert

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Relations among net-transfer reaction progress, 18O-13C depletion, and fluid infiltration in a clinohumite-bearing marble

Article Abstract:

An analysis describing a siliceeous dolomitic marble xenolith is presented. The xenolith is an internal part of a mid-crustal Jurassic diorite which displays isotpoic evidence for infiltration of water-rich fluid. Fluid composition models show that a Darcy flux combined with diffusive transport in the fluid generated isotopic shifts and net-transfer reactions shown in the xenolith.

Graphite, Seepage, Seepage (Hydrology), Xenoliths

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