Day 5: Mesozoic volcanic rocks of the central Sierra Nevada Arc

2014 ◽  
pp. 75-82 ◽  
Author(s):  
Scott R. Paterson ◽  
Vali Memeti
Keyword(s):  
Sierra Nevada ◽  
Volcanic Rocks

Lithologic, geomorphic, and climatic controls on sand generation from volcanic rocks in the SIERRA NEVADA de Santa Marta massif (ne Colombia)

2022 ◽  
pp. 106076
Author(s):  
D. Hatzenbühler ◽  
L. Caracciolo ◽  
G.J. Weltje ◽  
A. Piraquive ◽  
M. Regelous
Keyword(s):  
Sierra Nevada ◽  
Volcanic Rocks

scholarly journals Trachyandesite of Kennedy Table, its vent complex, and post−9.3 Ma uplift of the central Sierra Nevada: Comment

2021 ◽  
Author(s):  
Emmanuel Gabet
Keyword(s):  
Lava Flow ◽  
Sierra Nevada ◽  
Volcanic Rocks ◽  
Rigid Block ◽  
Field Evidence ◽  
San Joaquin River ◽  
Table Mountains

Hildreth et al. (2021) analyzed a set of table mountains near the San Joaquin River that are capped by a 9.3 Ma trachyandesite lava flow and concluded that, since the deposition of the volcanic rocks, the table mountains have been tilted 1.07° due to uplift of the central Sierra Nevada. While Gabet (2014) suggested that, under a limited set of conditions, the size of fluvial gravels under the table mountains would support the hypothesis of postdepositional uplift, the authors claimed that their evidence is more definitive. In addition, the authors proposed that the central Sierra Nevada tilted as a rigid block. However, their analyses rely on inferences and assumptions that are not supported by field evidence.

scholarly journals Reconstructing the Physical and Chemical Development of a Pluton-Porphyry Complex in a Tectonically Reorganized Arc Crustal Section, Tioga Pass, Sierra Nevada

Lithosphere ◽  
2020 ◽  
Vol 2020 (1) ◽  
pp. 1-26
Author(s):  
Katie Ardill ◽  
Valbone Memeti ◽  
Scott Paterson
Keyword(s):  
Sierra Nevada ◽  
Volcanic Rocks ◽  
Zircon Geochronology ◽  
Magmatic System ◽  
East Central ◽  
Hypabyssal Intrusions ◽  
Magmatic Processes ◽  
History Of ◽  
Scale Structures ◽  
Physical And Chemical

Abstract In ancient or partially eroded arc sections, a protracted history of tectonism and deformation makes interpretation of local volcanic-plutonic relationships challenging. The fragmentary preservation of volcanic rocks relative to the extensive plutonic record in upper-crustal arc sections also suggests that a broader-scale approach that includes volcanic-hypabyssal-plutonic “fields” is useful. In this context, studies of hypabyssal intrusions emplaced at the intersection of volcanic and plutonic fields provide additional physical and chemical constraints on shallow-level magmatic processes. New mapping, U-Pb zircon geochronology, and geochemistry at Tioga Pass, in the central Sierra Nevada arc section, document the physical and chemical evolution of the Tioga Pass hypabyssal complex, a ca. 100 Ma system that includes an intrusive dacite-rhyolite porphyry unit and comagmatic Tioga Lake quartz monzodiorite. We interpret these units as a Cretaceous subvolcanic magma feeder system intruding a package of tectonically displaced Triassic and Jurassic volcanic and sedimentary rocks, rather than the previous interpretation of a Triassic caldera. The Tioga Pass magmatic system is a well-exposed example of a hypabyssal complex with meso- to micro-scale structures that are consistent with rapid cooling and emplacement between 0–6 km depth and compositions suggestive of extensive fractionation of largely mantle-derived magma. The Tioga Pass porphyry unit is one of many hypabyssal intrusions scattered along a ~50-kilometer-wide belt of the east-central Sierra Nevada that are spatially associated with coeval volcanic and plutonic rocks due to tectonic downward transfer of arc crust. They provide a valuable perspective of shallow magmatic processes that may be used to test upper-crustal plutonic-volcanic links in tectonically reorganized arc sections.

Sign in / Sign up

Export Citation Format

Share Document