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U-Pb Zircon Ages from the Milford Orthogneiss, Milford Sound, Northern Fiordland

Author:
Publisher:
ISBN:
Category : Gneiss
Languages : en
Pages : 46

Book Description

U-Pb Zircon Ages from the Milford Orthogneiss, Milford Sound, Northern Fiordland

Author:
Publisher:
ISBN:
Category : Gneiss
Languages : en
Pages : 46

Book Description

Chemical and Isotopic Trends and Tectonics of the Milford Gneiss Complex and Darran Batholith of Northern Fiordland, New Zealand

Author: Peter Blattner
Publisher:
ISBN:
Category : Batholiths
Languages : en
Pages : 50

Book Description

Vertical Coupling and Decoupling in the Lithosphere

Author: John Grocott
Publisher: Geological Society of London
ISBN: 9781862391598
Category : Science
Languages : en
Pages : 356

Book Description
" ... developed out of two symposia: 'Deformation at Convergent Margins', convened at the European Union of Geosciences meeting (EUG XI) at Strasbourg in April 2001; and 'Vertical Coupling and Decoupling at Convergent Margins', convened at the AGU Fall meeting in San Francisco in December 2001"--Acknowledgements.

Geology of the Wakatipu Area

Author: I. M. Turnbull
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 86

Book Description

Crustal Cross Sections from the Western North American Cordillera and Elsewhere

Author: Robert Bruce Miller
Publisher: Geological Society of America
ISBN: 0813724562
Category : Science
Languages : en
Pages : 324

Book Description
"Exposed crustal cross sections provide a unique direct view of continental crust, and are a major source of insights into variations in lithologic and geochemical composition, structural style, metamorphism, plutonism, and rheology with progressive depth through the crust. This volume provides a synthesis of crustal cross sections with a special emphasis on Phanerozoic sections from the western North American Cordillera, supplemented by articles on lower- and mid-crustal sections through Proterozoic crust in North America and Australia, and the classic crustal section of Fiordland, New Zealand. Many of the papers describe multidisciplinary research on crustal sections and include data from various combinations of structural analysis, geochemistry, geothermobarometry, geochronology, geophysics, and other disciplines. The volume also discusses common problems for the interpretation of crustal cross sections, including how sections that expose deep-crustal rocks are eventually exhumed, and leading to the conclusion that there is no simple 'standard model' for continental crust. This volume will be useful to those interested in structural geology, tectonics, geodynamics, regional geology, petrology, geochemistry/isotope geology, and geophysics."--Pub. desc.

New Zealand Journal of Geology and Geophysics

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 132

Book Description

Geochronology and Pressure-temperature Conditions of Mid-to-lower Crustal Processes in a Cretaceous Magmatic Arc, Fiordland, New Zealand

Author: Karen Ann Parker
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 182

Book Description
Exposures of mid-to lower-crust in Fiordland contain evidence of high temperature and pressure processes occurring beneath magmatic arcs. This thesis presents new U-Pb zircon ages that constrain emplacement of the Malaspina Pluton, Western Fiordland Orthogneiss (WFO) to 116-114 Ma and new Sm-Nd garnet ages of 115-110 Ma for partial melting of the Malaspina near the Doubtful Sound Shear Zone (DSSZ), central Fiordland. U-Pb igneous zircon ages, from west to east across Doubtful Sound (DS), are 114.2 ± 2.2, 115.4 ± 2.2, and 116.1 ± 2.4 Ma. This compares to a contact metamorphic zircon rim age of 114.8 ± 2.4 Ma for the 119.8 ± 2.9 Ma Misty Pluton. From west to east across DS, Sm-Nd garnet ages are 113.6 ± 2.5, 113.2 ± 2.8, 115.6 ± 2.6, 111.6 ± 3.1, 110.6 ± 1.9, 113.3 ± 2.6, and 111.9 ± 3.0 Ma. Hence partial melting and garnet granulite-facies metamorphism lasted [symbol for greater than or equal to] 5 m.y. in DS and occurred within 5.5 m.y. of pluton emplacement. These ages compare to Sm-Nd garnet ages for garnet granulite of 126-109 Ma in northern Fiordland (Pembroke) and ca. 110 Ma in southern Fiordland (Resolution Island). Mineral assemblages in DS migmatite include Amp + Cpx + Grt + Qtz + Pl ± Bt + Rt + Ilm ± relict OPx ± relict Czo. Euhedral, peritectic garnet occurring in leucocratic veins and reaction zones, has little zoning in composition and ranges from Alm_53 Prp_27 Sps_3 Grs_17 in the west to Alm_44 Prp_36 Sps_1.5 Grs_18.5 in the east. Ilmenite with exsolved rutile and oriented exsolution needles of rutile in garnet indicate re-equilibration after high T and P. Phase diagram sections for melted WFO and thermobarometry using garnet, clinopyroxene, and plagioclase compositions indicate 700-840°C and 10.6-14.2 kbar for metamorphism on DS. Similar methods for Pembroke Granulite of>750°C at 12-16 kbar indicate diachronous widespread high P metamorphism and partial melting for this ca. 4,375 km^2 section of mid-to lower-crust with these processes occurring early in the north and later in the south (126-105) Ma.