Late Cretaceous–Paleocene metamorphic evolution of the Sierra Nevada de Santa Marta: Implications for Caribbean geodynamic evolution

2012 ◽  
Vol 34 ◽  
pp. 1-9 ◽  
Author(s):  
Carlos Zuluaga ◽  
Harold Stowell
Keyword(s):  
Sierra Nevada ◽  
Late Cretaceous ◽  
Geodynamic Evolution ◽  
Metamorphic Evolution

The Ganj Complex reinterpreted as a Late Cretaceous volcanic arc: Implications for the geodynamic evolution of the North Makran domain (southeast Iran)

2020 ◽  
Vol 195 ◽  
pp. 104306 ◽  
Author(s):  
Edoardo Barbero ◽  
Morteza Delavari ◽  
Asghar Dolati ◽  
Emilio Saccani ◽  
Michele Marroni ◽  
...  
Keyword(s):  
Late Cretaceous ◽  
Geodynamic Evolution ◽  
Volcanic Arc ◽  
The North

scholarly journals Distinguishing the Mélange-Forming Processes in Subduction-Accretion Complexes: Constraints from the Anisotropy of Magnetic Susceptibility (AMS)

Geosciences ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 381 ◽  
Author(s):  
Claudio Robustelli Test ◽  
Andrea Festa ◽  
Elena Zanella ◽  
Giulia Codegone ◽  
Emanuele Scaramuzzo
Keyword(s):  
Magnetic Susceptibility ◽  
Late Cretaceous ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Magnetic Fabric ◽  
Early Eocene ◽  
Accretionary Complex ◽  
Geodynamic Evolution ◽  
Structural Investigations ◽  
Laboratory Investigations ◽  
Magnetic Features

The strong morphological similitude of the block-in-matrix fabric of chaotic rock units (mélanges and broken formations) makes problematic the recognition of their primary forming-processes. We present results of the comparison between magnetic fabric and mesoscale structural investigations of non-metamorphic tectonic, sedimentary, and polygenetic mélanges in the exhumed Late Cretaceous to early Eocene Ligurian accretionary complex and overlying wedge-top basin succession in the Northern Apennines (northwest Italy). Our findings show that the magnetic fabric reveals diagnostic configurations of principal anisotropy of magnetic susceptibility (AMS) axes orientation that are well comparable with the mesoscale block-in-matrix fabric of mélanges formed by different processes. Broken formations and tectonic mélanges show prolate and neutral-to-oblate ellipsoids, respectively, with magnetic fabric elements being consistent with those of the mesoscale anisotropic “structurally ordered” block-in-matrix fabric. Sedimentary mélanges show an oblate ellipsoid with a clear sedimentary magnetic fabric related to downslope gravitational emplacement. Polygenetic mélanges show the occurrence of a cumulative depositional and tectonic magnetic fabric. The comparison of field and laboratory investigations validate the analysis of magnetic features as a diagnostic tool suitable to analytically distinguish the contribution of different mélange forming-processes and their mutual superposition, and to better understand the geodynamic evolution of subduction-accretion complexes.

Tectonic evolution of the central California margin as reflected by detrital zircon composition in the Mount Diablo region

2021 ◽  
Author(s):  
Jared T. Gooley ◽  
Marty Grove ◽  
Stephan A. Graham
Keyword(s):  
Sierra Nevada ◽  
Late Cretaceous ◽  
Late Miocene ◽  
Detrital Zircon ◽  
Middle Eocene ◽  
Forearc Basin ◽  
Zircon Age ◽  
Central California ◽  
Sierra Nevada Batholith ◽  
Early Paleogene

ABSTRACT The Mount Diablo region has been located within a hypothesized persistent corridor for clastic sediment delivery to the central California continental margin over the past ~100 m.y. In this paper, we present new detrital zircon U-Pb geochronology and integrate it with previously established geologic and sedimentologic relationships to document how Late Cretaceous through Cenozoic trends in sandstone composition varied through time in response to changing tectonic environments and paleogeography. Petrographic composition and detrital zircon age distributions of Great Valley forearc stratigraphy demonstrate a transition from axial drainage of the Klamath Mountains to a dominantly transverse Sierra Nevada plutonic source throughout Late Cretaceous–early Paleogene time. The abrupt presence of significant pre-Permian and Late Cretaceous–early Paleogene zircon age components suggests an addition of extraregional sediment derived from the Idaho batholith region and Challis volcanic field into the northern forearc basin by early–middle Eocene time as a result of continental extension and unroofing. New data from the Upper Cenozoic strata in the East Bay region show a punctuated voluminous influx (>30%) of middle Eocene–Miocene detrital zircon age populations that corresponds with westward migration and cessation of silicic ignimbrite eruptions in the Nevada caldera belt (ca. 43–40, 26–23 Ma). Delivery of extraregional sediment to central California diminished by early Miocene time as renewed erosion of the Sierra Nevada batholith and recycling of forearc strata were increasingly replaced by middle–late Miocene andesitic arc–derived sediment that was sourced from Ancestral Cascade volcanism (ca. 15–10 Ma) in the northern Sierra Nevada. Conversely, Cenozoic detrital zircon age distributions representative of the Mesozoic Sierra Nevada batholith and radiolarian chert and blueschist-facies lithics reflect sediment eroded from locally exhumed Mesozoic subduction complex and forearc basin strata. Intermingling of eastern- and western-derived provenance sources is consistent with uplift of the Coast Ranges and reversal of sediment transport associated with the late Miocene transpressive deformation along the Hayward and Calaveras faults. These provenance trends demonstrate a reorganization and expansion of the western continental drainage catchment in the California forearc during the late transition to flat-slab subduction of the Farallon plate, subsequent volcanism, and southwestward migration of the paleodrainage divide during slab rollback, and ultimately the cessation of convergent margin tectonics and initiation of the continental transform margin in north-central California.

Cretaceous sedimentary blanketing and tectonic rejuvenation in the Western Klamath moutains: Insights from thermochronology

2010 ◽  
Vol 2 (2) ◽  
Author(s):  
Geoffrey Batt ◽  
Gregory Harper ◽  
Matthew Heizler ◽  
Mary Roden-Tice
Keyword(s):  
Sierra Nevada ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Sedimentary Basin ◽  
Local Maximum ◽  
Normal Faulting ◽  
Klamath Mountains ◽  
Maximum Thickness

AbstractWe present new thermochronometric analyses of 4 samples from the Western Klamath mountains in California and Oregon, together with a re-evaluation of available geological constraint from a thermo-tectonic perspective. Early Cretaceous cooling of basement samples is seen to reflect significant exhumation by normal faulting, linked to the Separation Episode during which the Klamah region was rifted away from the formerly contiguous Sierra Nevada block. Syn-faulting sedimentation and subsequent Early Cretaceous re-heating of samples establishes the former continuity of scattered Hornbrook Formation remnants as a significant sedimentary basin spanning the Klamath region, with local maximum thickness of at least 5 km. This basin experienced significant inversion during early Cordilleran development around 110–120 Ma, with further unrooting and almost complete eversion in the Late Cretaceous, associated with Laramide uplift of the region.

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