کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9531869 | 1638790 | 2005 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Preferential retrogression of high-P metasediments and the preservation of blueschist to eclogite facies metabasite during exhumation, Diahot terrane, NE New Caledonia
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کلمات کلیدی
KyanitePrPOMPPHGBlueschistGLNTTNALMCPXLWSGRsAUGOmphaciteParagoniteAugitejadeiteGRTMetasedimentHBLChlAMPSPSBRSClinopyroxenelawsonitephengiteACTAlbite - آلبیتAlmandine - آلمندینAmphibole - آمفیبولEclogite - اکلوژیتTitanite - تایتانیکCZO - جلوDiopside - دیوپسایدRutile - روتیلP–T pseudosection - شبه توزیع P-TMetabasite - متابازیتGrossular - نقره ایHornblende - هورنبلندPyrope - پودرChlorite - کلریتQuartz - کوارتز Garnet - گارنت Glaucophane - گلوافان
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Preferential retrogression of high-P metasediments and the preservation of blueschist to eclogite facies metabasite during exhumation, Diahot terrane, NE New Caledonia Preferential retrogression of high-P metasediments and the preservation of blueschist to eclogite facies metabasite during exhumation, Diahot terrane, NE New Caledonia](/preview/png/9531869.png)
چکیده انگلیسی
High-P metabasites of the Diahot terrane, NE New Caledonia occur as spatially restricted (cm to km-scale) lenses, boudins and layers in psammitic to pelitic metasediments. Although interlayered, the two rock types preserve distinct, tectonically disrupted metamorphic profiles in the transition from lawsonite blueschist in the SW to low-T eclogite in the NE. As the metabasites experienced comparatively low strain, igneous textures, and, more rarely, igneous minerals are preserved. Metamorphic assemblages in the metabasites range from lawsonite-omphacite-glaucophane-bearing assemblages (Zone 1; P=7-10 kbar, T=350-400 °C) in the SW, through clinozoisite-almandine-bearing assemblages (Zone 2; P=14-16 kbar, T=450-550 °C) and finally to clinozoisite-almandine-hornblende-omphacite-bearing assemblages (Zones 3 and 4; P=16-18 kbar, T=550-600 °C) in the NE. Metasedimentary assemblages range from spessartine-lawsonite-albite-chlorite (Zone 1), through almandine-clinozoisite-albite-chlorite (Zone 2) and almandine-epidote-omphacite-albite-bearing (Zone 3) lithologies. Mineral inclusion trails in coarse-grained albite and garnet in Zones 2 and 3 metasediments record prograde mineral assemblages that match the P-T conditions recorded by the metabasites (P=14-18 kbar, T=450-600 °C). The metasediments were intensely deformed at peak conditions (P=12-16 kbar, T=550-600 °C) and during retrogression, and developed coarse-grained albite, phengite and chlorite-bearing assemblages. Differences in strain history (competency contrasts), the timing of major dehydration reactions and variation in whole rock composition all played vital roles in developing the distinctive field relationships involving blueschist to eclogite facies metabasites enclosed within strongly retrogressed high-T blueschist to greenschist facies metasedimentary lithologies exposed in NE New Caledonia.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Lithos - Volume 83, Issues 1â2, July 2005, Pages 67-96
Journal: Lithos - Volume 83, Issues 1â2, July 2005, Pages 67-96
نویسندگان
J.A. Fitzherbert, G.L. Clarke, R. Powell,