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Title:
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Timing of Cenozoic volcanism and Basin and Range extension innorthwestern Nevada; new constraints from the northern Pine ForestRange
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Reference Number:
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2011
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ISSN:
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0016-7606
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Publication Year:
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2006
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GeoREF Number:
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2006-013198 (View Original Data File)
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Authors:
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Colgan, Joseph P; Dumitru, Trevor A; McWilliams, Michael O; Miller,Elizabeth L
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Descriptors:
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absolute age; apatite; Ar/Ar; basalts; Basin and Range Province; basinrange structure; Cenozoic; correlation; dates; dip-slip faults;Eocene; exhumation; extension; extension faults; faults; fission-trackdating; geochemistry; Humboldt County Nevada; igneous rocks; lava;lava flows; major elements; Miocene; Neogene; Nevada; normal faults;North America; Oligocene; Paleogene; phosphates; Pine Forest Range;Tertiary; trace elements; United States; uplifts; volcanic rocks;volcanism
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Source:
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Geological Society of America Bulletin, vol.118, no.1-2, pp.126-139,Feb 2006
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Abstract:
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Eocene-middle Miocene volcanic rocks in the northern Pine ForestRange, Nevada, are ideally situated for reconstructing the timing andstyle of volcanism and extensional faulting in the northwesternmostpart of the Basin and Range province. A conformable sequence ofCenozoic volcanic and sedimentary strata in the northern Pine ForestRange dips approximately 30 degrees W, and 11 new (super 40) Ar/(super 39) Ar ages from this sequence define 3 major episodes ofvolcanic activity. Pre-Tertiary basement and older (ca. 38 Ma)Tertiary intrusive rocks are overlain unconformably by Oligocene (ca.30-23 Ma) basalt flows and dacitic to rhyolitic ash-flow tuffsinterbedded with fine-grained tuffaceous sedimentary rocks. Oligocenerocks are overlain by approximately 550 m of ca. 17-16 Ma basalt flowsequivalent to the Steens Basalt in southern Oregon, and basalt flowsare capped by a thin 16.3 Ma ignimbrite that likely is correlativewith either the Idaho Canyon Tuff or the Tuff of Oregon Cany!
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Notes:
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With GSA Data Repository Item 2006013
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Copyright:
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GeoRef, Copyright 2007, American Geological Institute. Referenceincludes data supplied by the Geological Society of America, Boulder,CO, United States
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