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Tuesday, May 19, 2020 | History

2 edition of Chemical compositional studies of marginal rift and plateau basalts from Saudi Arabia found in the catalog.

Chemical compositional studies of marginal rift and plateau basalts from Saudi Arabia

D. G. Coles

Chemical compositional studies of marginal rift and plateau basalts from Saudi Arabia

by D. G. Coles

  • 155 Want to read
  • 21 Currently reading

Published .
Written in English

    Subjects:
  • Petrology -- Saudi Arabia.

  • Edition Notes

    Statementby David George Coles.
    The Physical Object
    Pagination[9], 97 leaves, bound :
    Number of Pages97
    ID Numbers
    Open LibraryOL15069957M

    The Columbia River Plateau basalts occupy a volume of , km3 and cover an area of , km2 and most of the basalt was erupted in a 2 million year period. These basalts are erupted onto continental crust through fissures rather than typical volcanic edifices. Flows spread out as sheet flows. The variation in chemistry is minimal. Flood basalts, continental breakup and the dispersal of Gondwana: evidence for periodic migration of upwelling mantle flows (plumes) A. Segev Geological Survey of Israel, 30 Malkhe Israel Street, Jerusalem , Israel (Email: @) Received: 18 October – Revised: 27 December – Accepted: 4 March Abstract.

    Giant dike swarms, often hundreds of kilometers long, have produced flood basalts in large igneous provinces since the early Proterozoic. Dike patterns described as radiating from a central source are actually syntectonic swarms that curve and diverge according to lithospheric stress regimes, but they are similar in origin to smaller swarms with parallel dikes.   INTRODUCTION. Magmatism along the Kenyan and Ethiopian Rifts, the associated flood basalts of northern Ethiopia and the volcanism of the Afar Depression (collectively the East African Rift System) represent one of the largest, currently active, continental igneous provinces (Fig. 1).In the Kenya sector of the East African Rift System alone, an estimated km 3 of mafic magma, including Cited by:

    Saudi Arabia Investigation Report (IR) SA GEOLOGY AND MINERAL DEPOSITS OF THE JABAL ASH SEUMTA QUADRANGLE KINGDOM OF SAUDI ARABIA by Charles L. Hummel U. S. Geological Survey and Abdullah 0. Ankary Ministry of Petroleum and Mineral Resources IT* S. On i or, i r.i! Survey Oi'KN i''li.K KKl'OKT JTJZ **/ / / This report is preliminary and hasCited by: 1.   The new major and trace element analyses of the Northern Ethiopian plateau basalts (Table 1 and Figs 3 and 4) confirm the existence of three main magma types spatially zoned according to their TiO 2 content (Pik et al., ) and allow a more precise definition of their zonal arrangement (Figs 1 and 2): Low-Ti tholeiites (LT), in the NW, are Cited by:


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Chemical compositional studies of marginal rift and plateau basalts from Saudi Arabia by D. G. Coles Download PDF EPUB FB2

Title: CHEMICAL COMPOSITIONAL STUDIES OF MARGINAL RIFT AND PLATEAU BASALTS FROM SAUDI ARABIA Redacted for privacy Abstract approved: Roman A.

Schmitt./ The analysis of 64 rock samples from Saudi Arabia and three samples from the axial trough of the Red Sea has been done. Instrumental neutron activation analysis (INAA) was the analytical.

Sea rift in southwest Saudi Arabia that started in the Ter-tiary and reached its climax at *5 Ma. This volcanic field is almost monotonous and is dominated by basalts that include mafic–ultramafic mantle xenoliths (gabbro, web-sterite, and garnet-clinopyroxenite).

The present work presents the first detailed petrographic and geochemical File Size: 9MB. Harrat Al-Birk volcanics are products of the Red Sea rift in southwest Saudi Arabia that started in the Tertiary and reached its climax at ~5 Ma.

This volcanic field is almost monotonous and is dominated by basalts that include mafic–ultramafic mantle xenoliths (gabbro, websterite, and garnet-clinopyroxenite). The present work presents the first detailed petrographic and geochemical notes Cited by: 1. in basalts, coastal plain, Saudi Arabia 7 2.

Chemical, normative, and spectrographic analyses of ultramafic inclusions in basalts, coastal plain, Saudi Arabia. 9 3. Electron microprobe analyses of olivines reported from these older and more widespread plateau basalts.

The present-day axial rift in the Red Sea began to develop Cited by: Harrat Al-Birk volcanics are products of Red Sea rift in southwest Saudi Arabia that started in the Tertiary and reached its climax ~5 Ma ago. This volcanic field is almost monotonous and is dominated by basalts that include mafic-ultramafic mantle xenoliths (gabbro, wesbsterite and garnet-clinopyroxenite).Cited by: 1.

Composition, Origin, and Differentiation of Basalt Magma in the Lesser Antilles Origin, and Differentiation of Basalt Magma in the Lesser Antilles", Caribbean Geophysical, Tectonic, and Petrologic Studies, Thomas W.

Donnelly Variations in the composition of the aluminous circum-oceanic basalts may reflect physico-chemical. Origins of chemical diversity of back-arc basin basalts: A segment-scale study of the Eastern Lau Spreading Center Antoine Be´zos,1,2 Ste´phane Escrig,1 Charles H.

Langmuir,1 Peter J. Michael,3 and Paul D. Asimow4 Received 10 July ; revised 24 January ; accepted 6 Cited by: A variety of mafic and ultramafic inclusions occur within the pyroclastic components of the Al Birk basalt, erupted on the southern Red Sea coastal plain of Saudi Arabia from Pleistocene time to the present.

Depleted harzburgites are the only inclusions contained within the basalts that were erupted through Miocene oceanic crust (15 km thick) in the vicinity of Jizan, whereas to the north in.

published studies with new data from throughout the province in order to assess chemical variations that exist at the scale of the entire province. This knowledge enables us to understand how the earth operates at sub-continental depths, and to describe the thermal, mineralogical and chemical structure of deep earth beneath the Western Size: 1MB.

Sample Test 2 Learn with flashcards, games, and more — for free. basalts and picritesçerupted in a well-defined space^time interval, and overlain by younger alkaline basalts with peridotite xenoliths, which provide direct evidence of the nature of the mantle section beneath the plateau.

Moreover, this CFB province corresponds to the region where Afro-Arabia continental break-up took place with. The study area is located in the lava caves successions of Pre-Quaternary age.

One of these successions is called Al-Howa tunnel (Fig.1) (Kempe and Al-Malabeh, ).Since the stability of the. African-Arabian intraplate basalts are age corrected as reported in the original publications and are from Syria, Jordan, Yemen, Saudi Arabia, Egypt, and Sudan.

Sheba Ridge data (ADM) are from. Because most SWC basalts lack these compositional features, we conclude that subducted fluids and sediments do not play an essential role in producing these magmas.

Rather, we infer that they formed by variable degree melting of a mixed mantle source consisting mainly of heterogeneously distributed OIB and mid‐ocean ridge basalt source by: Petrochemistry of Cenozoic basalts and associated rocks in the Baikal rift zone.

In: N.A. Logatchev and P.A. Mohr (editors), Geodynamics of the Baikal Rift Zone. Tectonophysics, The main episode of Cenozoic volcanic activity occurred simultaneously with forma- tion of the Sayanaikal uplift, before the rift depressions were by: The East African Rift (EAR) or East African Rift System (EARS) is an active continental rift zone in East EAR began developing around the onset of the Miocene, 22–25 million years ago.

In the past it was considered to be part of a larger Great Rift Valley that extended north to Asia Minor. The rift, a narrow zone, is a developing divergent tectonic plate boundary where the. Sedimentary geology of Saudi Arabia (Geology of the Arabian Peninsula) Paperback – January 1, by R.

W Powers (Author) See all formats and editions Author: R. W Powers. Al Haruj area lies in the central part of Libya and represents the largest volcanic province in the country (∼16, km 2; Busrewil and Suwesi, ). Bellair et al. () documented two episodes of post-oligocene basaltic activity in the area.

The earlier episode give rise to extensive plateau basalts, while the latter produced a series of volcanic by: Abstract. Field work, sedimentological investigations and bio- stratigraphical data from the Jeddah area provides new information on the Tertiary depositional history of the Red Sea in the central coastal area of western Saudi by: 4.

Pb, Nd, and Sr isotopic compositions and the 40 Ar- 39 Ar ages of lavas from seamounts in the Joban seamount chain, which is the northernmost Cretaceous seamount chain in the northwest Pacific, suggest that these seamounts were produced by HIMU-type (high-μ or high- U/ Pb) magmatism around Ma.

In addition, seamount chains in the western Pacific, which are coeval Cited by: 5. How do continental-rift eruptions form flood basalts? Huge sheets of low viscosity lava erupt and form huge sheets, these sheets can layer on top of one another forming plateaus.

Identify some of the major volcanic hazards, and explain how they develop.Middle Tertiary rift volcanism in a continental-rift valley in the Arabian-Nubian Shield was the first surface expression of active mantle convection beneath an axis that was to become the Red Sea.

Investigation of the coastal plain of southwestern Saudi Arabia suggests that the rift valley was filled with basaltic and felsic to rhyolitic volcanic rocks (Ad Darb and Damad formations), cherty.Compositional Diversity of Late Cenozoic Basalts in a Transect Across the Southern Washington Cascades' Implications for Subduction Zone Magmatism WILLIAM P.

LEEMAN, • DIANE R. SMITH, 2 WES HILDRETH, 3 ZEN PALACZ, AND NICK ROGERS 4 Major volcanoes of the Southern Washington Cascades (SWC) include the large Quaternary.