Jeremy Keith Hourigan · University of California, Santa Cruz · PhdFit
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Jeremy Keith Hourigan
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University of California, Santa Cruz · Earth and Planetary Sciences
Jeremy Keith Hourigan is a Professor in the Earth & Planetary Sciences Department at UC Santa Cruz. His expertise lies in thermochronology, structural geology, and tectonics. He is based in the Earth & Marine Sciences building, office A221, and can be contacted via phone at 831-459-2873 or email at hourigan@ucsc.edu. The information provided highlights his research focus on understanding geological processes through the study of thermochronology and structural geology, which are key to interpreting tectonic activity and the thermal history of rocks.
The lithology, composition, U-Pb LA-ICP-MS ages of detrital zircons from sediments of the Western Kamchatka Basin (Russian Far East) provide important insight into paleogeography and tectonic setting of the Sea of Okhotsk in the Eocene. Our study is based on mapping, structural observations, descriptions of the sections and lithology, composition of the sandstones, and U-Pb LA-ICP-MS dating and morphology analysis of detrital zircons from the Eocene sandstones of the Western Kamchatka Basin. The provenance for the sandstones is mainly associated with orogen recycling in magmatic arcs. The analysis of heavy minerals indicates mafic to sialic sources. The mafic terranes of the Asian margin on the west or/and Olyutorka-Kamchatka ensimatic island arc affected the mechanism transferring the basic material to the Western Kamchatka Basin in the Eocene. The sialic clasts originated from continental blocks of the Asian margin and the Okhotsk-Chukotka volcanic belt. New data allow us to prove that the erosion of the Okhotsk-Chukotka belt had a significant influence on the sedimentation system in the north of the Sea of Okhotsk in the Eocene. We can assume that the Paleo-Penzhina River system already existed in the Eocene. The existence of the sialic sources in Eocene allows us to assume the possibility of finding the good quality collectors in the Eocene deposits of the Western Kamchatka Basin and the north of the Sea of Okhotsk.
Geological Society of America eBooks · 2022 · 12 citations
Geology
Geochemistry
Paleontology
ABSTRACT The highest-grade Barrovian-type metamorphic rocks of the North American Cordillera exposed today are Late Cretaceous in age and found within an orogen-parallel belt of metamorphic core complexes for which the tectonic histories remain controversial. Thermobarometric studies indicate that many of these Late Cretaceous metamorphic assemblages formed at pressures of >8 kbar, conventionally interpreted as >30 km depth by assuming lithostatic conditions. However, in the northern Basin and Range Province, detailed structural reconstructions and a growing body of contradictory geologic data in and around the metamorphic core complexes indicate these metamorphic rocks are unlikely to have ever been buried any deeper than ~15 km depth (~4 kbar, lithostatic). Recent models controversially interpret this discrepancy as the result of “tectonic overpressure,” whereby the high-grade mineral assemblages were formed under superlithostatic conditions without significant tectonic burial. We performed several detailed studies within the Snake Range metamorphic core complex to test the possibility that cryptic structures responsible for additional burial and exhumation might exist, which would refute such a model. Instead, our data highlight the continued discordance between paleodepth and paleopressure and suggest the latter may have reached nearly twice the lithostatic pressure in the Late Cretaceous. First, new detrital zircon U-Pb geochronology combined with finite-strain estimates show that prestrain thicknesses of the lower-plate units that host the high-pressure mineral assemblages correspond closely to the thicknesses of equivalent-age units in adjacent ranges rather than to those of the inferred, structurally overridden (para) autochthon, inconsistent with cross sections and interpretations that assume a lower plate with a deeper origin for these rocks. Second, new Raman spectroscopy of carbonaceous material of upper- and lower-plate units identified an ~200 °C difference in peak metamorphic temperatures across the northern Snake Range detachment but did not identify any intraplate discontinuities, thereby limiting the amount of structural excision to motion on the northern Snake Range detachment itself, and locally, to no more than 7–11 km. Third, mapped geology and field relationships indicate that a pre-Cenozoic fold truncated by the northern Snake Range detachment could have produced ~3–9 km of structural overburden above Precambrian units, on the order of that potentially excised by the northern Snake Range detachment but still far short of expected overburden based on lithostatic assumptions. Fourth, finite-strain measurements indicate a shortening (constrictional) strain regime favorable to superlithostatic conditions. Together, these observations suggest that pressures during peak metamorphism may have locally reached ~150%–200% lithostatic pressure. Such departures from lithostatic conditions are expected to have been most pronounced above regions of high heat flow and partial melting, and/or at the base of regional thrust-bounded allochthons, as is characteristic of the spatial distribution of Cordilleran metamorphic core complexes during the Late Cretaceous Sevier orogeny.
New U‒Pb (LA-ICP-MS) geochronological data have been obtained on accessory zircons from granodiorites and on detrital zircons from stream-sediment samples from the Shipunsky massif in the Eastern Kamchatka region. The age of accessory zircons from amphibole–biotite granodiorites has been estimated at 49–44 Ma. Detrital zircons have the Late Paleocene–Early Eocene age from ~57 to ~49 Ma. Based on the geological and geochronological data, the massif was formed in two stages: a gabbroid intrusion (56‒51 Ma) and the quartz diorite-granodiorite intrusion (49‒44 Ma). In terms of the petrographic and geochemical characteristics of the Upper Cretaceous–Eocene volcanic rocks in the Shipunsky Peninsula and granitoids in the Shipunsky massif, they were formed in the suprasubduction setting. The Shipunsky granitoids belong to the I-type granites. The Shipunsky massif was formed as a part of the Kronotsky intraoceanic paleoarc during the Paleocene–Eocene in two stages. The southern segment of the Kronotsky paleoarc collided with the Kamchatka continental margin and the deformed rocks of this massif were brought to the surface.
<p>The topography, climate, and geology of the central Patagonian Andes provide an auspicious natural laboratory to track long-term rates of erosion in a dynamic mountainous landscape. Herein, we report a mountain-scale record of erosion rates in the central Patagonian Andes from >10 million years (Ma) ago to present, which covers the transition from a fluvial to alpine glaciated landscape. Apatite (U-Th)/He ages of 72 granitic cobbles from alpine glacial deposits show slow erosion before ~6 Ma ago, followed by a two- to three-fold increase in the spatially averaged erosion rate of the source region after the onset of alpine glaciations and a 15-fold increase in the top 25% of the distribution. This transition is followed by a pronounced decrease in erosion rates over the past ~3 Ma. We ascribe the pulse of fast erosion to local deepening and widening of valleys, which are characteristic features of alpine glaciated landscapes. The subsequent decline in local erosion rates may represent a return toward a balance between rock uplift and erosion.</p>
Geosphere, February 2020, v. 16, no. 1, 258-280, doi:10.1130/GES02105.1, Supplemental Items. Item 1: Figure S1. Thin section image of the volcanic sandstone (wacke) from the block in the Sierra City mélange, polarizers crossed. Item 2: Volcanic sandstone (wacke) sample from the Sierra City mélange thin section description. Item 3: ArcGIS files for the digitized geologic map of the Bowman Lake and Sierra Buttes vicinity. Item 4: Table of sensitive high-resolution ion microprobe–reverse geometry (SHRIMP-RG) analytical U-Th-Pb data for zircons from magmatic rocks of the Northern Sierra terrane. Item 5: Laser-ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) analytical U-Th-Pb data for detrital zircons from the sandstone sample, Sierra City mélange.