Journal Article The Crossite Content of Ca-Amphibole as a Guide to Pressure Metamorphism Get access E. H. BROWN Dept. Geology, Western Washington State CollegeBellingham, 98225 Search for other works by this author on: Oxford Academic Google Scholar Petrology, Volume 18, Issue 1, February 1977, Pages 53–72, https://doi.org/10.1093/petrology/18.1.53 Published: 01 1977 history Received: 07 January 1976 Revision received: June

Research Article| March 01, 1974 Comparison of the Mineralogy and Phase Relations Blueschists from North Cascades, Washington, Greenschists Otago, New Zealand EDWIN H. BROWN 1Department Geology, Western Washington State College, Bellingham, 98225 Search for other works by this author on: GSW Google Scholar Author Article Information Publisher: Geological Society America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print 0016-7606 GSA Bulletin (1974) 85 (3): 333–344....

Research Article| April 01, 1993 A magma-loading model for Barrovian metamorphism in the southeast Coast Plutonic Complex,British Columbia and Washington EDWIN H. BROWN; BROWN 1Department of Geology, Western University, Bellingham 98225 Search other works by this author on: GSW Google Scholar NICHOLAS W. WALKER 2Department Geological Sciences, University Texas, Austin, Texas 78712 GSA Bulletin (1993) 105 (4): 479–500. https://doi.org/10.1130/0016-7606(1993)105<0479:AMLMFB>2.3.CO;2 Article...

Cretaceous granulite facies metamorphism in the Fiordland area of New Zealand has distinctive mineralogical, textural and structural features that set it apart from most other regional metamorphic belts. The metamorphism, developed over a 30×150‐km consequence 20‐km‐thick increment to crustal thickness, is closely associated space time with large plutonic complex, Western Orthogneiss (WFO). Although temperatures pressures as high 700 °C 12 kbar were attained, overprint on earlier...

Pre-Tertiary rock units on the western flank of Cascades in Washington and southern British Columbia constitute Northwest system (NWCS). This litho-tectonic package is characterized by predominantly oceanic lithologies subjected to high P/T metamorphism structurally mixed form a regional melange. Although focus this report rocks NWCS as originally defined, survey geology suggests broadening limits include San Juan Islands, Pacific Rim complex, pre-Tertiary central Cascades. The Shuksan...

Detrital zircon geochronology of this report pertains to Cretaceous orogeny in northwest Washington, an event that involved blueschist metamorphism and emplacement nappes the San Juan Islands – Cascades thrust system continental arc magmatism associated Barrovian neighboring Coast Plutonic Complex. Structurally low system, quartzose gneiss Yellow Aster Complex yields entirely Precambrian suite detrital zircons, with age pattern is similar Ordovician miogeoclinal rocks outboard Yukon–Tanana,...

Research Article| November 01, 1982 Petrologic, structural, and age relations of serpentinite, amphibolite, blueschist in the Shuksan Suite Iron Mountain–Gee Point area, North Cascades, Washington E. H. BROWN; BROWN 1Department Geology, Western University, Bellingham, 98225 Search for other works by this author on: GSW Google Scholar D. L. WILSON; WILSON RICHARD LEE ARMSTRONG; ARMSTRONG 2Department Geological Sciences, University British Columbia, Vancouver, Canada V6T 2B4 J. HARAKAL Author...

Research Article| May 01, 2000 Pluton emplacement by sheeting and vertical ballooning in part of the southeast Coast Plutonic Complex, British Columbia E.H. Brown; Brown 1Department Geology, Western Washington University, Bellingham, 98225, USA Search for other works this author on: GSW Google Scholar W.C. McClelland 2Department Geology Geological Engineering, University Idaho, Moscow, Idaho 83844, Author Article Information Publisher: Society America Received: 30 Oct 1998 Revision 19 Jul...

A sequence of Jurassic rocks on Fidalgo Island, Washington, is interpreted to be ophiolite. The order rock types, from the base upward, serpentinite, layered gabbro, a dike complex made up mostly plagiogranite, volcanic that are dominantly keratophyre, coarse breccia with clasts keratophyre and pelagic argillite, siltstone-sandstone turbidites. plagiogranites keratophyres have identical chemical compositions mutually gradational in field setting textures, all which suggests they cogenetic....

Abstract The area mapped, south-east of Middlemarch, is underlain by schist but also includes several small Tertiary outliers basanitic volcanic rocks resting on a thin formation quartz sands and conglomerates. In this paper the lithology, mineralogy, structure are described. following conclusions drawn: (1) bedding in wide range thicknesses recognisable schist, (2) lies within biotite possibly garnet zone metamorphism, (3) retrogressive metamorphism occurred appears to have been accompanied...

Metamorphic stretching lineations throughout the Crystalline Core of North Cascades, Washington, show a strong preferred orientation in horizontal NW‐SE direction. Foliations strike NW and dip steeply. Preliminary observations shear sense features indicate noncoaxial right‐lateral motion. We interpret these to that was broad, zone. The ages fabrics, as recorded by metamorphic minerals syntectonic plutons, range from pre 85‐Ma south post 45‐Ma north; thus regime active during an extended...

The protolith and metamorphic histories of Early Cretaceous blueschists that occur in Washington, Oregon, California are remarkably similar. These the Shuksan suite northwestern Condrey Mountain schist northern southern Pickett Peak terrane southwestern Oregon. We suggest these bodies were coextensive during their formation. Dispersion occurred Late time by lateral translation up to 900 km along continental margin response oblique plate convergence.

The San Juan Islands – northwest Cascades thrust system in Washington and British Columbia is composed of previously accreted terranes now assembled as four broadly defined composite nappes stacked on a continental footwall Wrangellia the Coast Plutonic Complex. Emplacement ages nappe sequence are interpreted from zircon ages, field relations, lithlogies, to young upward. basal was emplaced prior early Turonian time (∼93 Ma), indicated by occurrence age-distinctive zircons this Sidney Island...