Occurrence Of The Ocean And Its Evolution Toward An Ophiolitic Suture

• Main Author: SAVU, Haralambie
• Format: Text
• Language: unknown
• Published: Zenodo 2013
• Subjects: rifting stage; ocean opening stage; ocean closing stage; post-collision stage.; Coleman; Kerguelen; Mount Ross; Pacific; Newfoundland
• Online Access: https://dx.doi.org/10.5281/zenodo.56853; https://zenodo.org/record/56853

Abstract. The process leading to the occurrence of the ocean and to its evolution toward an ophiolitic suture can be separated into four stages. The first is the pre-ocean continental rifting stage, during which within-plate dyke swarm complexes are engendered. The rifting process is going into the spreading process of the second stage, which leads to the opening of the ocean, during the evolution of which an ocean crust is generated. This crust is formed of ocean floor N-Type and E-Type MORB rocks and of scarce oceanic sedimentary deposits. During the third stage, the closing of the ocean takes place, which is determined by processes of subduction, which lead to the consumption of the ocean crust and the occurrence of the island arcs, engendering calc-alkaline igneous rocks. The volcanic arcs usually are associated with important masses of sedimentary deposits. A regional and a load metamorphism often occur during this stage, too. This stage ends with the manifestation of the thrust phenomena. During the fourth, post-collision, stage a disjunctive tectonics is active. There occur the epicontinental sedimentary basins and the manifestation of a collateral continental magmatic activity. : {"references": ["Coleman, R.G.,1977, Ophiolites, Berlin, 229 p.", "Giu\u015fc\u0103, D., Cioflica, G., 1957, Structura p\u00e2nzei intrusive de la C\u0103z\u0103ne\u015fti-", "Ciungani, Bul. Univ. Bucure\u015fti, 13, 163-172, Bucure\u015fti", "Haase, K.M., Devey, C.W.,1996, Geochemistry of lavas from the Ahu and", "Tupa volcanic fields, Easter Hotspot, Southeast Pacific: introduction", "for intraplate magma genesis near a spreading axis, Earth", "Planet. Sci. Lett., 137, (1-4), 129-143, Amsterdam", "Hatch, F.H., Wells, A.K., Hatch, M.K.,1961, Petrology of the igneous", "rocks, London, 515 p.", "Irvine, T. N. & Baragar, W. R. (1971). A guide to the chemical classification", "of the common igneous rocks. Canadian Journal of Earth", "Sciences 8, 523\u2013548.", "Malpas, J., Stevens, R.K.,1977, Origin and emplacement of the ophiolitic", "suite, with examples from Western Newfoundland, Geotectonika-", "Moskow, 6. 83-102.", "O\u2019Connor, J.T.,1965, A classification of quartz rocks based on feldstar", "ratios, U.S. Geol. Surv. Prof. Pap. Washington, D. C., 525, 79-84.", "Page, B.M.,1966, Coast Ranges province, In: Geology of Northern California.", "Bull. California Div. Mines and Geology, 190, 253-321.", "Pearc e, J.A., Gale, G.H.,1977, Identification of ore deposition environment", "from trace element geochemistry of associated igneous", "host rocks, In: M.J. Jones (Ed.) Volcanic processes in ore genesis.", "Inst. Mining and Metalurgy and Geol. Soc. Spec. Publ. 7, 14-24,", "London.", "Perfit, M.R., Gust, D.A., Bence, A.E., Arc ulus, P.J., Taylor, B.R.,1980, Chemical", "characteristics of island arc basalts: implications for mantle", "source, Chem. Geol. 30, 117-256, Amsterdam.", "Saulea, E.,1967, Geologie Istoric\u0103, Bucure\u015fti, 838 p.", "Savu, H.,1962, Corpul gabbroic de la Alm\u0103\u015fel \u015fi petrogeneza ofiolitelor", "din Masivul Drocea, An. Com. Geol., XXXII, 211-256.", "Savu, H., 1967, Die mesozo\u00efsche Ophiolite der rum\u00e4nischen Karpathen.", "Acta Geol. Acad. Sci. Hung., 11, 1-3, 59-70, Bucuresti", "Savu, H.,1972, Metalogeneza asociat\u0103 magmatismului ofiolitic din", "Mun\u0163ii Drocea, D.S. Inst. Geol., LVIII, 93-119, Bucure\u015fti", "Savu, H.,1983, Geotectonic and magmatic evolution of the Mure\u015f", "Zone (Apuseni Mountains, Romania), An. Inst. Geol. Geofiz., LXI,", "253-262, Bucure\u015fti", "Savu, H.,1984, The sheeted dyke complex in the Mure\u015f Zone, Apuseni", "Mountains. Rev. Roum. G\u00e9ol, 28, 29-34, Bucure\u015fti", "Savu, H.,1986, Triassic, continental intra-plate volcanism in North Dobrogea,", "Rev. Roum. G\u00e9ol., 30, 21-29, Bucure\u015fti.", "Savu, H.,1988, Asem\u0103n\u0103ri petrografice \u015fi geochimice \u00eentre unele magmatite", "mesozoice timpurii din Carpa\u0163ii Orientali \u015fi Dobrogea de", "Nord. Stud. cerc. geol. 33, 29-38, Bucure\u015fti.", "Savu, H.,1998, Origin and evolution of a Carpathian triple junction, An.", "Univ. Bucure\u015fti, XLVII, 3-12, Bucure\u015fti.", "Savu, H.,1999, Origin and evolution of two Alpine ophiolitic sutures", "on the territory of Romania. An, Univ. Bucure\u015fti, XLVIII, 15-25,", "Bucure\u015fti", "Savu, H., 2002, Genesis of oceanic trondhjemites and related quartz", "rocks from the Alpine ophiolites of the Mure\u015f Zone. Rev. Roum.", "G\u00e9ol., 46, 29-45, Bucure\u015fti", "Savu, H., 2003, Trondhjemitic magmas engendered by the island", "arc bimodal volcanism in the Mure\u015f Zone, Romania, Proc. Rom.", "Acad., Series B, 2003, 1-2, 39-43.", "Savu, H., 2005, Tectono-magmatic evolution of the Romanian territory", "and origin of its bent orogen structures, Geo-Eco-Marina,", "9-10/2004, 116-132, Bucure\u015fti.", "Savu, H., 2007, Genesis of the Mure\u015f ophiolitic suture and its N-Type", "MORB rocks and island arc volcano-plutonic association, Proc.", "Rom. Acad., Series B, 2007, 1, 23-32, Bucure\u015fti.", "Savu, H., 2008, Lamprophyres from the Pre-Variscan South Carpathian", "granitoid province, Romania: geochemical data and origin, Proc.", "Rom. Acad., Series B, 2008, 3, 277-285, Bucure\u015fti.", "Savu, H.,2009, Genesis of the Carpathian ophiolitic suture and origin", "of its varied magmatic rocks, Romania, Proc. Rom Acad., Series B,", "2009, 2-3, 141-150, Bucure\u015fti.", "Savu, H., Udrescu C., Neac\u015fu, V., Stoian, M.,1984a, Trends of tholeiitic", "magma differentiation in the sheeted dyke complex from the", "Mure\u015f Zone, Apuseni Mountains, Rev. Roum. G\u00e9ol. 28, 29-34,", "Bucure\u015fti.", "Savu, H., Udrescu, C., Neac\u015fu, V., 1984b Petrology and geochemistry of", "the layered dyke of Alma\u015f-Seli\u015fte, Mure\u015f Zone, Romania, Miner.", "Slov. Kosice, 16, 1, 43-49, Kosice.", "Savu, H., Udrescu, C., Neac\u015fu, V., Bratosin, I., Stoian, M.,1985, Origin, geochemistry", "and tectonic position of the Alpine ophiolites in the", "Severin Nappe (Mehedin\u0163i Plateau, Romania), Ofioliti, 10, 2/3,", "423-440, Bucure\u015fti.", "Savu, H., Udrescu, C., Neac\u015fu, V.,1986, Bimodal volcanism in the northern", "island arc of the Mure\u015f Zone, D.S. Inst. Geol. Geofiz. 70-71, 1,", "153-170, Bucure\u015fti.", "Savu H., Udrescu C., Lemne M., Romanescu O., Stoian M., Neac\u015fu V., 1987,", "Island arc volcanics related to the wildflysch on the outer margin", "of the Danubian Autochthone, South Carpathians, and their", "geotectonic implications, Rev. Roum. G\u00e9ol., 31, 19-28, Bucure\u015fti.", "Savu H., Stef\u0103nescu M., Grabary G.,1994, Petrology and tectonic setting", "of the volcanics associated wth the Tithonian-Berriasian flysch", "from the Bratocea Unit , East Carpathians, An. Univ. Bucure\u015fti,", "XLIII, 39-48, Bucure\u015fti.", "Uyeda, S. (1981), Some thoughts on geodynamics of Asia, Geol. Surv.", "Japan Rep, 1981, 261, 1-6, Higashi.", "Walker, F., Poldervart, A. (1949), Karroo dolerites of the Union of South", "Africa, Geol. Soc. Am. Bull, 60, 591-706, Washington D.C.", "Weis, D., Frey, F.A., Giret, A., Comagrel, J.M. (1998), Geochemical characteristics", "of the youngest volcano (Mount Ross) in the Kerguelen", "Archipelago: inferences for magma flux, lithosphere, assimilation", "and composition of the Kerguelen plume, J. Petrology, 39,", "5, 973, Oxford."]}