02551nas a2200205   4500008004100000245009100041210006900132300001200201490000700213520190700220653001602127653003202143653003102175653001102206653001602217653002502233100002002258700001702278856005002295       1998                        eng d00aPartial Eclogitization of the Ambolten Gabbro-norite, North-east Greenland Caledonides0 aPartial Eclogitization of the Ambolten Gabbronorite Northeast Gr  a273-2920 v783 a<p>Partially eclogitized igneous bodies composed of gabbro, leucogabbro, anorthosite and cross-cutting diabase dikes are well represented in the North-East Greenland Eclogite Province. A 200 x 100 meter intrusive body on Ambolten Island (78?? 20' N, 19?? 15' W) records a prograde transition from gabbro-norite to eclogite facies coronitic metagabro-norite surrounded by hydrated margins of undeformed to strongly foliated amphibolite. Igneous plagioclase + olivine + enstatite + augite + oxides convert to eclogite facies assemblages consisting of garnet, omphacite, diopside, enstatite, kyanite, zoisite, rutile and pargasitic amphibole through several coronitic reactions. Relict cumulus plagioclase laths are replaced by an outer corona of garnet, an inner corona of omphacite and an internal region of sodic plagioclase, garnet, kyanite, omphacite and zoisite. Olivine and intercumulus pyroxene are partly replaced by metamorphic pyroxenes and amphibole. The corona structures, zoning patterns, diversity of mineral compositions in a single thin section, and preservation of metastable asemblages are characteristic of diffusion-controlled metamorphism. The most extreme disequilibrium is found in static amphibolites, where igneous pyroxenes, plagioclase domains with eclogite facies, assemblages, and matrix amphibole coexist. Complete eclogitization was not attained at Ambolten due to a lack of fluids needed to drive diffusion during prograde and retrograde metamorphism. The P-T conditions of the high-pressure metamorphism are estimated at ??? 750??C and &gt; 18 kbar. Well-equilibrated, foliated amphibolites from the margin of the gabbro-norite supports our contention that the entire North-East Greenland Eclogite Province experienced Caledonian high-pressure metamorphism, even though no eclogite facies assemblages have been found in the quartzofeldspathic host gneisses to date.</p>
10aanorthosite10across-cutting diabase dikes10aeclogitized igneous bodies10agabbro10aleucogabbro10aNorth-East Greenland1 aGilotti, J., A.1 aElvevold, S.  uhttps://pubs.er.usgs.gov/publication/7002133500599nas a2200157   4500008004100000245006900041210006900110260005400179300001200233653001200245100002000257700001800277700001900295700001700314856011000331       1998                        eng d00aProgressive Mylonitization of Diabase Along a Major Thrust Fault0 aProgressive Mylonitization of Diabase Along a Major Thrust Fault  aPrinceton, New JerseybPrinceton University Press  a400-40110ageology1 aGilotti, J., A.1 aSnoke, W., A.1 aTullis, J., A.1 aTodd, V., R.  uhttps://www.nysm.nysed.gov/staff-publications/progressive-mylonitization-diabase-along-major-thrust-fault00523nas a2200133   4500008004100000245007200041210006900113260003500182300001000217653001200227100002000239700002000259856011000279       1994                        eng d00aEclogites and Related High-pressure Rocks from North-east Greenland0 aEclogites and Related Highpressure Rocks from Northeast Greenlan  bGeological Survey of Greenland  a77-9010ageology1 aGilotti, J., A.1 aHiggins, A., K.  uhttps://www.nysm.nysed.gov/staff-publications/eclogites-and-related-highpressure-rocks-northeast-greenlan01492nas a2200169   4500008004100000245009900041210006900140300001200209490000700221520091700228653001501145653003201160653003101192653002501223100002001248856005401268       1993                        eng d00aDiscovery of a Medium-temperature Eclogite Province in the Caledonides of North-East Greenland0 aDiscovery of a Mediumtemperature Eclogite Province in the Caledo  a523-5260 v213 a<p>Basic and acid-intermediate bodies containing eclogite-facies parageneses were discovered during recent mapping in North-East Greenland. Scattered throughout an orthogneiss complex, eclogitic pods extend from approximately lat 76°40'N to the northern limit of the area mapped (78°N), a province comparable in size to the eclogite-bearing Western Gneiss region of Norway. The eclogites are the medium-temperature type typically formed in overthickened continental crust during continent-continent collision. An Early Proterozoic event cannot be ruled out, but field relations and regional correlations suggest that the high-pressure metamorphism may be Caledonian. Paleozoic eclogites in Greenland would negate current tectonic models for Caledonian collision that envision simple subduction of Baltica beneath Laurentia, while Early Proterozoic eclogites would be the oldest bona fide eclogites known.</p>
10aCaledonian10aeclogite-facies parageneses10ahigh-pressure metamorphism10aNorth-East Greenland1 aGilotti, J., A.  uhttp://geology.gsapubs.org/content/21/6/523.short