Distinct mantle sources for Pliocene–Quaternary volcanism beneath the modern Sierra Nevada and adjacent Great Basin, northern California and western Nevada, USA | Zendy

Brian Cousens | Zendy; Christopher D. Henry | Zendy; Vishal Gupta | Zendy

Open Access

Distinct mantle sources for Pliocene–Quaternary volcanism beneath the modern Sierra Nevada and adjacent Great Basin, northern California and western Nevada, USA

Author(s) -

Brian Cousens,

Christopher D. Henry,

Vishal Gupta

Publication year - 2012

Publication title -

geosphere

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.879

H-Index - 58

ISSN - 1553-040X

DOI - 10.1130/ges00741.1

Subject(s) - geology , mantle (geology) , lithosphere , geochemistry , subduction , mafic , mantle plume , quaternary , asthenosphere , crust , volcanism , earth science , volcano , paleontology , tectonics

Latest Pliocene to Quaternary, mildly alkaline, mafic to intermediate volcanic activity extends in a swath from the Lake Tahoe region in the eastern Sierra Nevada across the western Great Basin to the Battle Mountain area, Nevada. From west to east, the volcanic centers exhibit a dramatic gradient in chemical and isotopic composition. Centers situated in or adjacent to the Sierra Nevada have incompatible element and isotopic compositions consistent with an old, subduction-modified lithospheric mantle source ( 87 Sr/ 86 Sr > 0.7045; 143 Nd/ 144 Nd 18 O > +6.5‰). Mafic volcanic centers east of the Sierra Nevada, in the Carson Sink and in the Buffalo Valley region, have an intraplate incompatible element and isotopic signature ( 87 Sr/ 86 Sr 143 Nd/ 144 Nd > 0.5127; δ 18 O

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