Early arc development recorded in Permian–Triassic plutons of the northern Mojave Desert region, California, USA

Cecil, M. Robinson; Ferrer, Mary Ann; Riggs, Nancy R.; Marsaglia, Kathleen M.; Kylander‐Clark, Andrew; Ducea, Mihai N.; Stone, Paul

doi:10.1130/b31963.1

Cited by 30 publications

(46 citation statements)

References 64 publications

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“…U/Yb ratios of Permian-Triassic grains (~0.1-2.2) are consistent with ratios of magma that was emplaced into the continental crust ( [62][63][64]66]; Figure 8(a)), and Th/U ratios (~0.2-0.9) are similar to Th/U ratios from zircons in plutons emplaced into the El Paso Terrane ( [12,14]; Figure 8 Figure 9). The Appalachian orogenies of northeastern Laurentia were likely the source for detrital zircon in the 280-500 Ma age group ( [59,69,70]; Figure 7).…”

Section: Detrital Zircon U-pb Geochronology and Geochemistrysupporting

confidence: 62%

“…More recent ages from plutons in Sonora, Mexico, and the El Paso terrane in southeastern California record local earliest arc magmatism at ca. 275 Ma ( [10][11][12][13]; Figure 1). The precise timing of subduction initiation, however, is uncertain, and the structural and sedimentological responses to the change in tectonic regime remain incompletely understood.…”

Section: Introductionmentioning

confidence: 99%

“…299-254 Ma; Figure 2). Stratigraphic and structural mapping suggests that Permian strata were deposited in the framework of contractional tectonism that was [36], Stevens and Stone [42], Arvizu et al [10], Chapman et al [82], and Cecil et al [12].…”

Section: Introductionmentioning

confidence: 99%

“…Strike-slip truncation is also recorded by metamorphic strike-slip ribbons that were transpressively accreted along the truncation zone in the Pennsylvanian-Permian time, inboard (east) of the Foothills ophiolite belt [6]. Between early Permian and Triassic times, the strike-slip boundary transitioned into a northwest-trending subduction zone with an active magmatic arc [6,7,9,12,39,40]. Initial convergence involved several thrusting events along the western margin of the continent, including the Last Chance thrust (Figure 1), which developed as a northeast-trending ramp-flat thrust with a regional decollement that extended southeastward beneath the Lone Pine Basin to the edge of the Mississippian platform [41,42].…”

Section: Introductionmentioning

confidence: 99%

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Cordilleran Subduction Initiation: Retroarc Timing and Basinal Response in the Inyo Mountains, Eastern California

et al. 2020

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Subduction zones drive plate tectonics on Earth, yet subduction initiation and the related upper plate depositional and structural kinematics remain poorly understood because upper plate records are rare and often strongly overprinted by magmatism and deformation. During the late Paleozoic time, Laurentia’s western margin was truncated by a sinistral strike-slip fault that transformed into a subduction zone. Thick Permian strata in the Inyo Mountains of central-eastern California record this transition. Two basins that were separated by a transpressional antiform contain sedimentary lithofacies that record distinct patterns of shoaling and deepening conditions before and during tectonism associated with subduction initiation. Sandstone petrography and lithofacies analysis show that rocks in a southeastern basin are dominated by carbonate grains derived from adjacent carbonate shelves, whereas sandstones in a northwestern basin are predominantly quartzose with likely derivation from distant ergs or underlying strata. Detrital zircon spectra from all but the youngest strata in both basins are typical of Laurentian continent spectra with prominent peaks that indicate ultimate sources in Appalachia, Grenville, Yavapai/Mazatzal, and the Wyoming or Superior cratons. The first Cordilleran arc-derived detrital zircon grains appear in the uppermost strata of the northwestern basin and record Late Permian (ca. 260 Ma) Cordilleran arc magmatism at this approximate latitude, and a possible source area is suggested by geochemical similarities between these detrital zircons and broadly coeval magmatic zircons in the El Paso Mountains to the southwest. Deformation responsible for basin partitioning is consistent with sinistrally oblique contraction in the earliest Permian time. The data presented from the Inyo Mountains shed more light on the nature of Cordilleran subduction initiation and the upper-crustal response to this transition.

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Section: Detrital Zircon U-pb Geochronology and Geochemistrysupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cordilleran Subduction Initiation: Retroarc Timing and Basinal Response in the Inyo Mountains, Eastern California

et al. 2020

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“…Applying a Principal Component transformation to the same Sentinel-2 image ( Figure 7C) compresses even more information into a single tricolor image, showing clear spatially coherent patterns consistent with expected mineralogical and textural differences spatially distributed across geologic units within the field site. We then unmix Sentinel-2 data using both the Maniobra AVIRIS endmembers resampled to Sentinel-2 spectral resolution ( Figure 8A) and local Sentinel-2 spectral endmembers derived from pixels with unobstructed exposure of the Goler and underlying basement units of the El Paso terrane ( [55]; Figure 8B). As in the case of the comparative matrix ( Figure 6), both unmixing products provide useful geologic information but local endmembers are clearly better suited to assist geologic mapping.…”

Section: Remote Sensing Analysismentioning

confidence: 99%

Spatial Patterns of Chemical Weathering at the Basal Tertiary Nonconformity in California from Multispectral and Hyperspectral Optical Remote Sensing

Sousa

2019

Remote Sensing

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Visible through shortwave (VSWIR) spectral reflectance of the geologic units across the basal Tertiary nonconformity (BTN) is characterized at three spatially disparate locations in California. At two of these sites, location-specific spectral endmembers are obtained from AVIRIS imaging spectroscopy and linear spectral mixture models are used to visualize spatial patterns in chemical weathering associated with the BTN. Weathering patterns are found to match well with traditional geologic maps of the BTN at each site, but results show more spatially detailed quantitative geologic information about the spatial variability of chemical weathering near the nonconformity than is possible in a traditional geologic map. Spectral endmembers and unmixing results are also compared across locations. At the two locations with AVIRIS coverage, strong absorptions centered near 2200 nm are observed, consistent with previous geologic publications reporting intense chemical weathering at the BTN. Information loss associated with multispectral sampling of the reflectance continuum is also examined by resampling endmembers from the Maniobra location to mimic the spectral response functions of the WorldView 3, Sentinel-2 and Landsat 8 sensors. Simulated WorldView 3 data most closely approximate the full information content of the AVIRIS observations, resulting in nearly unbiased unmixing results for both endmembers. Mean fraction differences are −0.02 and +0.03 for weathered and unweathered endmembers, respectively. Sentinel-2 and Landsat 8 are unable to distinguish narrow, deep SWIR absorptions from changes in the overall amplitude of the SWIR spectral continuum, resulting in information loss and biased unmixing results. Finally, we characterize a third location using Sentinel-2 observations only. At this site we also find spectrally distinct features associated with several lithologies, providing new information relevant to the mapping of geologic contacts which is neither present in high spatial resolution visible imagery, nor in published geologic mapping. Despite these limitations, the spatial pattern of the Sentinel-2 and Landsat 8 fraction estimates is sufficiently similar to that of the WorldView 3 and AVIRIS fraction estimates to be useful for mapping purposes in cases where hyperspectral data are unavailable.

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Geochemistry and geochronology of Permian plutonic rocks at the north‐western margin of Gondwana

et al. 2023

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The occurrence of Permian magmatic rocks in the Colombian Andes is restricted to a few localities. Previous works have focused mainly on explaining its tectonic setting, whereas petrogenesis has received less attention. This study closes this gap by reporting whole‐rock geochemistry, zircon U–Pb geochronology, trace elements and Hf isotopes from massive and mylonitic granitoids along central Colombia to constrain their age, source and petrogenesis. Our results show that the granitoids have a calc‐alkaline character, are rich in light‐rare elements (LREEs) and large‐ion lithophile elements (LILEs), present negative Nb and Ti anomalies, crystallized between ca. 276–265 Ma and show variable εHf(i) values ranging from −1.5 to +1.7. Combining our results with published geochemical, geochronological and isotopic data from this region, we suggest that the Middle Permian granitoids from the Tolima region were formed in a continental magmatic arc installed at the western margin of Gondwana, where partial melting of the mantle wedge and further crustal assimilation of the magmas with an old radiogenic and heterogeneous crust were essential processes for the modification of the source of the magmas that generated the granitoids. The Middle Permian may have reached the peak magmatic conditions (ca. 280–270 Ma), according to the recurrence of ages in this time interval. This period of magmatic activity may have been interrupted by the Triassic extensional period related to the beginning of the Pangea breakup.

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Early arc development recorded in Permian–Triassic plutons of the northern Mojave Desert region, California, USA

Cited by 30 publications

References 64 publications

Cordilleran Subduction Initiation: Retroarc Timing and Basinal Response in the Inyo Mountains, Eastern California

Cordilleran Subduction Initiation: Retroarc Timing and Basinal Response in the Inyo Mountains, Eastern California

Spatial Patterns of Chemical Weathering at the Basal Tertiary Nonconformity in California from Multispectral and Hyperspectral Optical Remote Sensing

Geochemistry and geochronology of Permian plutonic rocks at the north‐western margin of Gondwana

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