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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Alexander Terrane (1)
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Asia
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Central Asia
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Pamirs (1)
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Far East
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China
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Kunlun Mountains (1)
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Karakoram (1)
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Tibetan Plateau (1)
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Australasia
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Australia (1)
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Cerro Prieto (1)
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Mexico
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Baja California Mexico (1)
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Baja California Sur Mexico
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Vizcaino Peninsula (1)
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North America
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Peninsular Ranges Batholith (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Gulf of California (1)
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North Pacific
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Northeast Pacific
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Gulf of California (1)
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United States
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California
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Northern California (1)
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Salton Trough (1)
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Santa Ana Mountains (1)
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Southern California (1)
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Klamath Mountains (1)
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elements, isotopes
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isotope ratios (2)
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isotopes
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stable isotopes
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Nd-144/Nd-143 (2)
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O-18/O-16 (1)
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Sr-87/Sr-86 (2)
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Lu/Hf (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
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rare earths
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neodymium
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Nd-144/Nd-143 (2)
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oxygen
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O-18/O-16 (1)
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geochronology methods
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Silverado Formation (1)
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Mesozoic
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Ladd Formation (1)
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Williams Formation (1)
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Paleozoic
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Precambrian
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upper Precambrian
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Ediacaran (1)
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Vendian (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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diorites
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tonalite (1)
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granites
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monzogranite (1)
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S-type granites (1)
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pegmatite (1)
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volcanic rocks (2)
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metamorphic rocks
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metamorphic rocks
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metasedimentary rocks (1)
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schists
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blueschist (1)
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minerals
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silicates
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orthosilicates
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nesosilicates
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zircon group
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zircon (3)
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Primary terms
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absolute age (4)
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Asia
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Central Asia
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Pamirs (1)
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Far East
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China
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Kunlun Mountains (1)
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Karakoram (1)
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Tibetan Plateau (1)
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Australasia
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Australia (1)
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Cenozoic
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Quaternary (1)
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Tertiary
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Neogene (1)
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Paleogene
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Paleocene
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Silverado Formation (1)
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geochemistry (1)
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igneous rocks
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plutonic rocks
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diorites
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tonalite (1)
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granites
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monzogranite (1)
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S-type granites (1)
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pegmatite (1)
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volcanic rocks (2)
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inclusions (1)
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isotopes
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stable isotopes
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Nd-144/Nd-143 (2)
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O-18/O-16 (1)
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Sr-87/Sr-86 (2)
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magmas (1)
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mantle (1)
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Mesozoic
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Cretaceous
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Middle Cretaceous (1)
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Upper Cretaceous
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Ladd Formation (1)
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Williams Formation (1)
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Jurassic (1)
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Triassic (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
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rare earths
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neodymium
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Nd-144/Nd-143 (2)
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metamorphic rocks
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metasedimentary rocks (1)
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schists
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blueschist (1)
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metasomatism (1)
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Mexico
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Baja California Mexico (1)
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Baja California Sur Mexico
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Vizcaino Peninsula (1)
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North America
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Peninsular Ranges Batholith (1)
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oxygen
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O-18/O-16 (1)
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Pacific Ocean
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East Pacific
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Northeast Pacific
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Gulf of California (1)
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North Pacific
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Northeast Pacific
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Gulf of California (1)
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paleogeography (1)
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Paleozoic
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Ordovician
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Upper Ordovician (1)
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petrology (1)
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plate tectonics (3)
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Precambrian
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upper Precambrian
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Proterozoic
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Neoproterozoic
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Ediacaran (1)
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Vendian (1)
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sedimentary rocks (1)
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sedimentation (1)
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United States
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California
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Northern California (1)
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Salton Trough (1)
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Santa Ana Mountains (1)
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Southern California (1)
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Klamath Mountains (1)
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rock formations
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Catalina Schist (1)
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sedimentary rocks
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sedimentary rocks (1)
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Triassic-Jurassic Granitoids and Pegmatites from Western Kunlun-Pamir Syntax: Implications for the Paleo-Tethys Evolution at the Northern Margin of the Tibetan Plateau
Oceanic magmatism in sedimentary basins of the northern Gulf of California rift
Non-Laurentian cratonal provenance of Late Ordovician eastern Klamath blueschists and a link to the Alexander terrane
The tectonic significance of early Paleozoic convergent-margin rocks of the Alexander and Sierran-Klamath terranes is poorly understood. New phengite 40 Ar/ 39 Ar and Rb-Sr results from the schist of Skookum Gulch of the Yreka subterrane in the Klamath Mountains (454 ± 10 Ma) confirm that blueschists are the oldest known subduction-zone rocks of the western North American Cordillera. The blueschists are juxtaposed with kilometer-scale tectonic blocks of ca. 565 Ma tonalite. Detrital zircons from the blueschists require close proximity to a diverse source of cratonal or derivative supracrustal rocks and preclude formation within an isolated intra-oceanic setting. This strong cratonal provenance (mostly 1.0–2.0 Ga, with resolved concentrations of 1.49–1.61 Ga zircon) is also exhibited by adjacent Early Devonian lower greenschist units of the Yreka subterrane (Duzel phyllite and Moffett Creek Formation). Additional results from temporally equivalent arc-derived sedimentary units (Sissel Gulch graywacke and Gazelle Formation) yield strongly unimodal zircon age distributions of early Paleozoic zircon. The results indicate that the Yreka subterrane formed at an Ordovician–Silurian–Early Devonian convergent margin near a Mesoproterozoic-Paleoproterozoic craton and Ediacaran crust. Appreciable 1.49–1.61 Ga zircon within the Yreka subterrane is compatible with a recent biogeographic analysis that indicates a non-Laurentian origin for the eastern Klamath terrane. Additional new data reveal that key early Paleozoic convergent-margin rocks within the northern Sierran-Klamath and Alexander terranes share similar arc and cratonal provenance, including 1.49–1.61 Ga zircon. We hypothesize that the rocks from all three areas are dispersed tectonic fragments that were derived from the same convergent margin and were independently transported to western North America. Of the orogenic source regions indicated by previous paleomagnetic and biogeographic analysis, the detrital zircon provenance favors western Baltica over eastern Australia.
The Catalina Schist: Evidence for middle Cretaceous subduction erosion of southwestern North America
The Catalina Schist underlies the inner southern California borderland of southwestern North America. On Santa Catalina Island, amphibolite facies rocks that recrystallized and partially melted at ca. 115 Ma and at 40 km depth occur atop an inverted metamorphic stack that juxtaposes progressively lower grade, high-pressure/temperature (PT) rocks across low-angle faults. This inverted metamorphic sequence has been regarded as having formed within a newly initiated subduction zone. However, subduction initiation at ca. 115 Ma has been difficult to reconcile with regional geologic relationships, because the Catalina Schist formed well after emplacement of the adjacent Peninsular Ranges batholith had begun in earnest. New detrital zircon U-Pb age results indicate that the Catalina Schist accreted over a ∼20 m.y. interval. The amphibolite unit metasediments formed from latest Neocomian to early Aptian (122–115 Ma) craton-enriched detritus derived mainly from the pre-Cretaceous wall rocks and Early Cretaceous volcanic cover of the Peninsular Ranges batholith. In contrast, lawsonite-blueschist and lower grade rocks derived from Cenomanian sediments dominated by this batholith's plutonic and volcanic detritus were accreted between 97 and 95 Ma. Seismic data and geologic relationships indicate that the Catalina Schist structurally underlies the western margin of the northern Peninsular Ranges batholith. We propose that construction of the Catalina Schist complex involved underthrusting of the Early Cretaceous forearc rocks to a subcrustal position beneath the western Peninsular Ranges batholith. The heat for amphibolite facies metamorphism and anatexis observed within the Catalina Schist was supplied by the western part of the batholith while subduction was continuous along the margin. Progressive subduction erosion ultimately juxtaposed the high-grade Catalina Schist with lower grade blueschists accreted above the subduction zone by 95 Ma. This coincided with an eastern relocation of arc magmatism and emplacement of the ca. 95 Ma La Posta tonalite-trondjhemite-granodiorite suite of the eastern Peninsular Ranges batholith. Final assembly of the Catalina Schist marked the initial stage of the Late Cretaceous–early Tertiary craton-ward shift of arc magmatism and deformation of southwestern North America that culminated in the Laramide orogeny.