Comments on the Distribution and Age of High-Grade Blueschists, Associated Eclogites, and Amphibolites from the Tiburon Peninsula, California

Dudley, Priscilla P.

doi:10.1130/0016-7606(1972)83[3497:cotdaa]2.0.co;2

Cited by 11 publications

(4 citation statements)

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“…Franciscan Complex samples analyzed here are from Ring Mountain in the Tiburon Peninsula (12,18) and Mount Hamilton in the Diablo Range (3,13,(19)(20)(21). Tiburon samples include garnet amphibolite (T-90-2AH) and eclogite blocks (T-90-3AG and T-90-3AB), actinoliterich rind (T-90-2B), and cross-cutting phengite and a chlorite vein (T-90-2V).…”

mentioning

confidence: 99%

Phengite-Based Chronology of K- and Ba-Rich Fluid Flow in Two Paleosubduction Zones

Catlos

Sorensen

2003

Science

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Subduction recycles aqueous fluids from slab and sediment to the mantle. Subduction zones are long-lived, but time scales for fluid-rock interaction within subduction complexes are uncertain. Large-ion lithophile elements (potassium and barium) were added to eclogite (subducted basalt) during high pressure/temperature metamorphism via phengite crystallization from subduction zone fluids. Phengite grains from eclogite blocks and their metasomatic selvages yielded 40Ar/39Ar ages across grains and between samples that indicate 25 and 60 million years of fluid-rock interaction in the Samana Complex, Dominican Republic, and the Franciscan Complex, California, respectively.

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mentioning

confidence: 99%

Phengite-Based Chronology of K- and Ba-Rich Fluid Flow in Two Paleosubduction Zones

Catlos

Sorensen

2003

Science

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“…The Ring Mountain Mélange is the most studied mélange of the Northern Coast Range-Diablo Range Franciscan Complex (Figure 1, RM, between RC and HM). Numerous studies of various aspects of the exotic blocks in the serpentinite-matrix mélange [52,55,56,105,[110][111][112][113][114], limited study of the serpentinite matrix [3,115], and large-scale (detailed) mapping [3,55,56,111] have both clarified many details of the mélange and led to conflicting interpretations (contrast [55] and [3]).…”

Section: The Ring Mountain Mélangementioning

confidence: 99%

Origin of Mélanges of the Franciscan Complex, Diablo Range and Northern California: An Analysis and Review

Raymond

2019

Geosciences

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The Franciscan Complex of California is characterized in part by the presence of mélanges. In general, mélange origins are attributed to sedimentary, tectonic, or diapiric processes—or a combination of these. Published reviews list the main features of mélanges characteristic of each type of origin. In this review, particular diagnostic features typical of sedimentary, tectonic, and diapiric mélanges are used to assess 15 specific mélanges, which in some cases have been interpreted in contrasting ways in the literature. The data do not support the view that most Franciscan mélanges were formed by sedimentary processes, but rather that both tectonic and sedimentary processes are important. There is little evidence that diapirism contributed significantly to Franciscan mélange genesis. Tectonic features present in most mélanges of subduction accretionary complexes create challenges in assessing mélange-forming processes. Notably, although tectonic overprints commonly mask the primary diagnostic fabric of sedimentary mélanges, some diagnostic features—such as depositional contacts, fossils in mélange matrix, and interlayering of mélange and non-mélange units—are critical to recognition of mélanges of sedimentary origin.

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“…; Taliaferro, 1943;Coleman and Lanphere, 1971;Dudley, 1972;Gilbert, 1973) Nevertheless, most of the ultramafic formations of the California Coastal Ranges to which these species are restricted, are extremely old.…”

Section: Have Proposed Nine Major Factors Of Varying Influence On Tmentioning

confidence: 99%

“…The multiple igneous intrusions and metamorphisms resulting in these ultramafic substrates date as far back as the mid to late Cretaceous (I 80 m.y.b.p. ; Taliaferro, 1943;Coleman and Lanphere, 1971;Dudley, 1972;Gilbert, 1973). However, Raven and Axelrod (1978) point out that serpentine species of Calochortus and other rarities were not yet in existence.…”

Section: A Synthetic Approachmentioning

confidence: 99%

CONCEPTS OF RARITY IN VASCULAR PLANT SPECIES, WITH SPECIAL REFERENCE TO THE GENUS CALOCHORTUS PURSH (LILIACEAE)

Fiedler¹

1986

TAXON

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT)is collaborating with JSTOR to digitize, preserve and extend access to Taxon. SummaryThe concept of rarity in vascular plant species since the mid-nineteenth century is reviewed with the purpose of illustrating the history of ideas about rare plant taxa. Because much of the more recent literature concerning rare plants focuses rather specifically on isolated features of individual species, a "synthetic approach" incorporating several relevant causes and consequences of rarity in the genus Calochortus is presented. The results of this early synthesis serve to demonstrate the inadequacy of earlier generalizing hypotheses about rarity, and the need for the clarification of both the causes and consequences of rare plants, as well as the frame of reference.

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Comments on the Distribution and Age of High-Grade Blueschists, Associated Eclogites, and Amphibolites from the Tiburon Peninsula, California

Cited by 11 publications

References 0 publications

Phengite-Based Chronology of K- and Ba-Rich Fluid Flow in Two Paleosubduction Zones

Phengite-Based Chronology of K- and Ba-Rich Fluid Flow in Two Paleosubduction Zones

Origin of Mélanges of the Franciscan Complex, Diablo Range and Northern California: An Analysis and Review

CONCEPTS OF RARITY IN VASCULAR PLANT SPECIES, WITH SPECIAL REFERENCE TO THE GENUS CALOCHORTUS PURSH (LILIACEAE)

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