Low ?18O silicic volcanic rocks at the Calabozos caldera complex, southern Andes

1987 ◽  
Vol 95 (1) ◽  
pp. 71-81 ◽  
Author(s):  
Anita L. Grunder
Keyword(s):  
Volcanic Rocks ◽  
Southern Andes ◽  
Silicic Volcanic

Regionally continuous Miocene rhyolites beneath the eastern Snake River Plain reveal localized flexure at its western margin: Idaho National Laboratory and vicinity

2020 ◽  
Vol 57 (3) ◽  
pp. 241-270
Author(s):  
Kyle L. Schusler ◽  
David M. Pearson ◽  
Michael McCurry ◽  
Roy C. Bartholomay ◽  
Mark H. Anders
Keyword(s):  
Volcanic Rocks ◽  
Snake River Plain ◽  
North American Plate ◽  
Snake River ◽  
Trace Element Geochemistry ◽  
Deep Borehole ◽  
Age Progression ◽  
Western Margin ◽  
Silicic Volcanic ◽  
River Plain

The eastern Snake River Plain (ESRP) is a northeast-trending topographic basin interpreted to be the result of the time-transgressive track of the North American plate above the Yellowstone hotspot. The track is defined by the age progression of silicic volcanic rocks exposed along the margins of the ESRP. However, the bulk of these silicic rocks are buried under 1 to 3 kilometers of younger basalts. Here, silicic volcanic rocks recovered from boreholes that penetrate below the basalts, including INEL-1, WO-2 and new deep borehole USGS-142, are correlated with one another and to surface exposures to assess various models for ESRP subsidence. These correlations are established on U/Pb zircon and 40Ar/39Ar sanidine age determinations, phenocryst assemblages, major and trace element geochemistry, δ18O isotopic data from selected phenocrysts, and initial εHf values of zircon. These data suggest a correlation of: (1) the newly documented 8.1 ± 0.2 Ma rhyolite of Butte Quarry (sample 17KS03), exposed near Arco, Idaho to the upper-most Picabo volcanic field rhyolites found in borehole INEL-1; (2) the 6.73 ± 0.02 Ma East Arco Hills rhyolite (sample 16KS02) to the Blacktail Creek Tuff, which was also encountered at the bottom of borehole WO-2; and (3) the 6.42 ± 0.07 Ma rhyolite of borehole USGS-142 to the Walcott Tuff B encountered in deep borehole WO-2. These results show that rhyolites found along the western margin of the ESRP dip ~20º south-southeast toward the basin axis, and then gradually tilt less steeply in the subsurface as the axis is approached. This subsurface pattern of tilting is consistent with a previously proposed crustal flexural model of subsidence based only on surface exposures, but is inconsistent with subsidence models that require accommodation of ESRP subsidence on either a major normal fault or strike-slip fault.

Contrasting origins of Cenozoic silicic volcanic rocks from the western Cordillera of the United States

2007 ◽  
Vol 70 (3) ◽  
pp. 251-267 ◽  
Author(s):  
Eric H. Christiansen ◽  
Michael McCurry
Keyword(s):  
United States ◽  
Volcanic Rocks ◽  
The United States ◽  
Western Cordillera ◽  
Silicic Volcanic

scholarly journals Correlations between silicic volcanic rocks of the St Mary's Islands (southwestern India) and eastern Madagascar: implications for Late Cretaceous India–Madagascar reconstructions

2009 ◽  
Vol 166 (2) ◽  
pp. 283-294 ◽  
Author(s):  
Leone Melluso ◽  
Hetu C. Sheth ◽  
John J. Mahoney ◽  
Vincenzo Morra ◽  
Chiara M. Petrone ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Volcanic Rocks ◽  
Silicic Volcanic ◽  
Southwestern India

Stratigraphy, paleomagnetism, geochronology and structure of silicic volcanic rocks, Waiotapu/Paeroa range area, New Zealand

Geothermics ◽  
1994 ◽  
Vol 23 (5-6) ◽  
pp. 473-499 ◽  
Author(s):  
GW Grindley ◽  
TC Mumme ◽  
BP Kohn
Keyword(s):  
New Zealand ◽  
Volcanic Rocks ◽  
Silicic Volcanic

scholarly journals The Song Da magmatic suite revisited: A petrologic, geochemical and Sr–Nd isotopic study on picrites, flood basalts and silicic volcanic rocks

2011 ◽  
Vol 42 (6) ◽  
pp. 1341-1355 ◽  
Author(s):  
Tran Viet Anh ◽  
Kwan-Nang Pang ◽  
Sun-Lin Chung ◽  
Huei-Min Lin ◽  
Tran Trong Hoa ◽  
...  
Keyword(s):  
Volcanic Rocks ◽  
Flood Basalts ◽  
Isotopic Study ◽  
Silicic Volcanic ◽  
Magmatic Suite

Detrital modes of the Riding Island Graywacke, north-central Newfoundland: evidence for deposition in a collisional successor basin in the Dunnage Zone

1994 ◽  
Vol 31 (1) ◽  
pp. 176-181 ◽  
Author(s):  
Gary G. Lash
Keyword(s):  
Volcanic Rocks ◽  
Island Arc ◽  
North Central ◽  
Arc Volcanism ◽  
Tectonic Environment ◽  
Complex Source ◽  
Island Arc Volcanism ◽  
Sandstone Provenance ◽  
Silicic Volcanic ◽  
Terrane Accretion

The Riding Island Graywacke (late Caradoc – Ashgill) crops out in Notre Dame Bay, north-central Newfoundland. Previous tectonic interpretations suggest that this succession of turbidites and hemipelagic mudstone accumulated in a basin adjacent to an active volcanic arc. The varied framework mineralogy of 29 Riding Island samples studied, however, records derivation from a complex source terrane composed of mafic and silicic volcanic rocks, sedimentary and metamorphic successions, and plutonic rocks. Assessment of the tectonic environment of deposition of the Riding Island Graywacke by use of popular sandstone provenance ternary diagrams yields ambiguous results. The mineralogy of the Riding Island samples reveals a change in tectonic scenario from one dominated by island-arc volcanism in pre-Caradoc time to a setting marked by tectonic shortening, transcurrent faulting, and terrane accretion near the end of the Ordovician. The complex composition of these sandstones and the fact that they accumulated after island-arc volcanism had ended argue for deposition in a collisional successor basin that formed during the early stages of mountain building along the proto-North American continental margin. This inferred Late Ordovician collisional successor basin may have also been the locus of deposition for other minera-logically complex late Caradoc – Ashgill units exposed in Notre Dame Bay, such as the Sansom Formation.

scholarly journals Petrochemistry of Late Miocene Peraluminous Silicic Volcanic Rocks from the Morococala Field, Bolivia

1998 ◽  
Vol 39 (4) ◽  
pp. 601-632 ◽  
Author(s):  
G. B. Morgan ◽  
D. London ◽  
R. G. Luedke
Keyword(s):  
Late Miocene ◽  
Volcanic Rocks ◽  
Silicic Volcanic
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