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Jalama Batholith
Fe-Mn phosphate associations as indicators of the magmatic-hydrothermal and supergene evolution of the Jálama batholith in the Navasfrías Sn-W District, Salamanca, Spain
A geochemical study of two peraluminous granites from south-central Iberia; the Nisa-Albuquerque and Jalama batholiths
Schematic sequence of the hydrothermal and supergene alteration of the phos...
Compaction-corrected paleomagnetic paleolatitudes for Late Cretaceous rudists along the Cretaceous California margin: Evidence for less than 1500 km of post–Late Cretaceous offset for Baja British Columbia
Rockbridgeite inclusion in rock crystal from Galileia region, Minas Gerais, Brazil
Beryllium in Silicic Magmas and the Origin of Beryl-Bearing Pegmatites
Phosphate mineral associations from the Tres Arroyos aplite-pegmatites (Badajoz, Spain): Petrography, mineral chemistry, and petrogenetic implications
A proposed new mineralogical classification system for granitic pegmatites
Continuous Be mineralization from two-mica granite to pegmatite: Critical element enrichment processes in a Himalayan leucogranite pluton
Insights into granite petrogenesis from quantitative assessment of the field distribution of enclaves, xenoliths and K-feldspar megacrysts in the Monte Capanne pluton, Italy
Paleogeography and Sedimentology of Upper Cretaceous Turbidites, San Diego, California
WinClbclas , a Windows program for columbite-supergroup minerals
Polyphased rare-element magmatism during late orogenic evolution: geochronological constraints from NW Variscan Iberia
Nb-ti-y-hree-w-u Oxide Minerals with Uncommon Compositions Associated with the Tungsten Mineralization in the Puy-les-vignes Deposit (massif Central, France): Evidence For Rare-metal Mobilization By Late Hydrothermal Fluids with a Peralkaline Signature
Textural and mineral-chemistry constraints on columbite-group minerals in the Penouta deposit: evidence from magmatic and fluid-related processes
MINERALOGY AND GEOCHEMISTRY OF PEGMATITES ON MOUNT BEGBIE, BRITISH COLUMBIA
Unraveling the link between mantle upwelling and formation of Sn-bearing granitic rocks in the world-class Dachang tin district, South China
ABSTRACT The upper Middle Eocene to Lower Miocene Sespe Formation is the youngest part of an ~7-km-thick Cretaceous–Paleogene forearc stratigraphic sequence in coastal southern California. Whereas Upper Cretaceous through Middle Eocene strata of southern California record a transition from local (i.e., continental-margin batholith) to extraregional (i.e., cratonal) provenance resulting from Laramide deformation (75–35 Ma), the Sespe Formation records the reversal of this process and the re-establishment of local sediment sources by Middle Miocene time. In contrast to underlying dominantly marine strata, the Sespe Formation primarily consists of alluvial/fluvial and deltaic sandstone and conglomerate, which represent terminal filling of the forearc basin. Prior to Middle Miocene dissection and clockwise rotation, the Sespe basin trended north-south adjacent to the west side of the Peninsular Ranges. The integration of paleocurrent, accessory-mineral, conglomerate, sandstone, and detrital zircon data tightly constrains provenance. Sespe sandstone deposited in the Late Eocene was supplied by two major rivers (one eroding the Sonoran Desert, to the east, and one eroding the Mojave Desert, Colorado River trough area, and Transition Zone, to the north), as well as smaller local drainages. As the Farallon slab rolled back toward the coast during the Oligocene, the drainage divide also migrated southwestward. During deposition of the upper Sespe Formation, extraregional sources diminished, while the Peninsular Ranges provided increasing detritus from the east and the Franciscan Complex provided increasing detritus from the west (prerotation). As the overall flux of detritus to the Sespe basin decreased and deposition slowed, nonmarine environments were replaced by marine environments, in which the Miocene Vaqueros Formation was deposited. The provenance and paleogeographic information presented herein provides new insights regarding the unique paleotectonic setting of the Sespe forearc from the Late Eocene through earliest Miocene. Nonmarine sedimentation of the Sespe Formation initiated soon after cessation of coastal flat-slab subduction of the Laramide orogeny and terminated as the drainage divide migrated coastward. Competing models for movement along the Nacimiento fault system during the Laramide orogeny (sinistral slip versus reverse slip to emplace the Salinian terrane against the Nacimiento terrane) share the fact that the Peninsular Ranges forearc basin was not disrupted, as it lay south and southwest of the Nacimiento fault system. The northern edge of the Peninsular Ranges batholith formed a natural conduit for the fluvial system that deposited the Sespe Formation.
SEQUENCE STRATIGRAPHY ALONG A TECTONICALLY ACTIVE MARGIN, PALEOGENE OF SOUTHERN CALIFORNIA
This field trip emphasizes the relationships between worldwide sea-level change, tectonic elements, and sequence development for Eocene and Oligocene rocks in the San Diego embayment and Ventura Basin. Participants will be exposed to criteria for recognition of unconformities, systems tracts, and parasequences developed in submarine canyon, deltaic, tidal, shoreface and coastal plain environments. The stratigraphic signature of tectonics and eustasy will be a pervasive theme. The objectives of this field trip are threefold: 1) Develop fades models for sediments deposited in fluvial, tidal, deltaic, shoreface, shelf, and deep-water environments; 2) Evaluate evidence for facies changes versus unconformable relationships in interpreting sedimentary sequences; and 3) Demonstrate the application of sequence-stratigraphy principles to tectonically active basins with complex stratigraphic relationships. In addition observations from wells, aerial photographs, and outcrops will be integrated in the Transverse Ranges to develop paleogeographic reconstruc tions of the basin and evaluate the influence of structural evolution on sequence development.