Abstract
The geological setting, petrography and bulk mineral chemistry of a monzodiorite and a presumably consanguineous megaporphyry with large (up to 25 cm) labradorite megacrysts, both intruding the upper Proterozoic Saramuj Conglomerate in south-west Jordan (south eastern shore of the Dead Sea), were examined. The crystallization temperatures of the monzodiorite and the megaporphyry as determined from pyroxene thermometry and supported by contact metamorphic mineralogy are about 700 and 900°C, respectively. The intrusion depth of the monzodiorite is about 3–4 km. The monzodiorite was emplaced in the Saramuj Conglomerate at about 595 + 2 Ma ago according to Rb/Sr and U/Pb age determinations.
The stratigraphic positions of the monzodiorite, megaporphyry and their host rock (the Saramuj Conglomerate) were compared with time-equivalent lithologies in the Arabian-Nubian Shield.
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Almond DC (1988) Chemical fractionation in titaniferous clinopyroxene from Bayuda, Sudan. Can Mineral 26: 1027–1035
Baubron JC, Delfour J, Vialette Y (1976) Geochronologic measurements (Rb/Sr; K/Ar) on rocks of the Arabian Shield, Kingdom of Saudi Arabia. Saudi Arabian Dir. Gen. Min. Res. Tech. Rep. 76-JED-22: 152 pp.
Bender F (1974) Explanatory notes on the geological map of Wadi Araba, Jordan (scale 1: 100000, 3 sheets). Geol. Jahrb. 10: 3–62
Bentor YK (1961) Petrographical outline of the Precambrian in Israel. Bull Res Coun Israel, Sect G 10G: 19–63
Bentor YK (1985) The crustal evolution of the Arabo-Nubian massif with special reference to Sinai Peninsula. Precambrian Res 28: 1–74
Bielski M (1982) Stages in the evolution of the Arabian-Nubian Massif in Sinai. Ph D Thesis, Hebrew University, Jerusalem: 155 pp.
Blanckenhorn M (1912) Naturwissenschaftliche Studien am Toten Meer and im Jordantal. Friedlaender, Berlin
Blaxland A, Gohn E, Haack U, Hoffer E (1979) Rb-Sr ages of late tectonic granites in the Damara orogen, SW Africa, Namibia. N Jb Miner Mh 11: 498–508
Brook M, Ibrahim K, McCourt WJ (1990) New geochronological data from the Arabian shield area of SW Jordan. Proceedings of the 3rd Jordan Geological Conference: 361–394
Carmichael ISE (1967) The iron-titanium oxides of salic volcanic rocks and their associated ferromagnesian silicates. Contrib Mineral Petrol 14: 36–64
Cooper JA, Stacey JS, Fleck RJ (1979) An evaluation of the zircon method of isotope dating in the southern Arabian Shield. Contrib Mineral Petrol 68: 429–439
Cox KG, Bell JD, Pankhurst RJ (1979) The Interpretation of Igneous Rocks. Allen & Unwin, London: 450 pp.
Deer WA, Howie RA, Zussman J (1962) Rock-forming Minerals (Sheet Silicates). Longman, London
De La Roche H, Leterrier P, Grandclaude P, Marchal M (1980) A classification of volcanic and plutonic rocks using R1-R2 diagram and major element analyses. Its relationship with current nomenclature. Chem Geol 29: 183–210
Delfour J (1970) Le groupe de J'Balah. BRGM Bull Ser 2, Sec IV 4: 19–32
Fitton JG, James D, Kempton PD, Ormerod DS, Leeman WP (1988) The role of lithospheric mantle in the generation of late Cenozoic basic magmas in the western United States. J Petrol Spec Lithosphere Issue: 331–349
Frey M, De Capitani C, Lion JG (1991) A new petrogenetic grid for the low-grade metabasite. J Metamorphic Geol 9: 497–509
Friz-Töpfer A (1991) Geochemical characterization of Pan-African dyke swarms in southern Sinai: from continental margin to intraplate magmatism. Precambrian Res 49: 281–300
Green TH (1980) Island arc and continent building magmatism — a review of petrogenetic models based on experimental petrology and geochemistry. Tectonophysics 63: 367–385
Greenwood RC, Edgar AD (1984) Petrogenesis of gabbros from Mt. St. Hilaire, Quebec, Canada. Geol J 19: 353–376
Greenwood WR, Hadley DG, Anderson RE, Fleck RJ, Schmidt DL (1976) Late Proterozoic cratonization in southwestern Saudi Arabia. Phil Trans R Soc London Ser A 280: 517–527
Hadley DG, Schmidt DL (1980) Sedimentary rocks and basins of the Arabian Shield and their evolution. In: Cooray P G, Tahoun S A, eds. Evolution and mineralization of the Arabian-Nubian Shield. Inst Appl Geol Jeddah Bull 3, 4: 25–50
Irvine TN, Baragar WRA (1971) A guide to the chemical classification of the common volcanic rocks. Cana J Earth Sci 8: 523–548
Jarrar G (1985) Late Proterozoic crustal evolution of the Arabian-Nubian Shield in Wadi Araba area, SW Jordan. Geol Jahrb 61: 3–87
Jarrar G, Wachendorf H, Zellmer H (1991) The Saramuj Conglomerate: Evolution of a Pan-African molasse sequence from southwest Jordan. N Jahrb Geol Paläont Mh H 6: 335–356
Jarrar G, Wachendorf H, Saffarini G (1992) A late Proterozoic bimodal volcanic/subvolcanic suite from Wadi Araba, SW Jordan. Precambrian Res 56: 51–72
Kretz R (1982) Transfer and exchange equilibria in a portion of the pyroxene quadrilateral as deduced from natural and experimental data. Geochim Cosmochim Acta 46: 411–421
Krogh TE (1973) A low contamination method for hydrothermal decomposition of zircons and extraction of U and Pb for isotopic age determination. Geochim Cosmochim Acta 37: 485–494
Le Bas MJ (1962) The role of aluminium in igneous pyroxenes with relation to their parentage. Am J Sci 260: 267–288
Lenz H, Bender F, Besang C, Harre W, Kreuzer H, Müller P, Wendt I (1972) The age of early tectonic events in the zone of the Jordan Geosuture based on radiometric data. 24th International Geological Congress Section 3: 371–379
Lindsley DH (1983) Pyroxene thermometry. Am Mineral 68: 477–493
Ludwig KR (1980) Calculation of uncertainties of U-Pb isotope data. Earth Planet Sci Lett 46: 212–220
McCourt WJ (1988) The geology, geochemistry and tectonic setting of the granitic rocks of SW Jordan. Bull NRA, Geol Div Amman: 10
Miyashiro A (1978) Nature of alkalic volcanic rock series. Contrib Mineral Petrol 66: 91–104
Miyashiro A (1979) Metamorphism amd Metamorphic Belts. Allen & Unwin, London: 492 pp.
Morimoto N (1988) Nomenclature of pyroxenes. Report of the Subcommittee on Pyroxenes, IMA. Min Mag 52: 535–550
Neumann ER (1976) Compositional relations using pyroxenes, amphiboles and other mafic phases in the Oslo region plutonic rocks. Lithos 9: 85–109
Odin GS, Gale NH, Auvray B, Bielski M, Doré F, Lancelot JR, Pasteels P (1983) Numerical dating of Precambrian-Cambrian boundary. Nature 301: 21–23
Pallister JS, Stacey JS, Fischer LB, Wayne RP (1988) Precambrian ophiolites of Arabia: geologic settings, U-Pb geochronology, Pb-isotope characteristics, and implications for continental accretion. Precambrian Res 38: 1–54
Phinney WC, Morrison DA, Maczuca DE (1988) Anorthosites and related megacrystic units in the evolution of Archean crust. J Petrol 29: 1283–1323
Reymer APS, Mathews A, Navon O (1984) Pressure-temperature conditions in the Wadi Kid metamorphic complex: implications for the Pan-African event in SE Sinai. Contrib Mineral Petrol 85: 336–345
Ringwood AE (1975) Composition and Petrology of the Earth's Mantle. McGraw-Hill, New York
Scott PW (1976) Crystallization trends of pyroxenes from the alkaline volcanic rocks of Tenerife, Canary Islands. Min Mag 40: 805–816
Serdyuchenko DP (1948) On the crystallochemical role of titanium in micas. Dokl Akad Sci USSR 59: 739
Smith JV, Brown WL (1988) Feldspar Minerals: Crystal Structures, Physical, Chemical, and Microtextural Properties. Vol 1, 2nd edn. Springer Verlag, Berlin: 828 pp.
Stacey JS, Kramers JD (1975) Approximation of terrestrial lead isotope evolution by a two-stage model. Earth Planet Sci Lett 26: 207–221
Steiger RH, Jäger E (1977) Subcommission on Geochronology: convention on use of decay constants in geo- and cosmochronology. Earth Planet Sci Lett 36: 359–362
Stern RJ, Hedge CE (1985) Geochronologic and isotopic constraints on late Precambrian crustal evolution in the Eastern Desert of Egypt. Am J Sci 285: 97–127
Stern RJ, Manton WI (1987) Age of Feiran basement rocks, Sinai: implications for late Precambrian crustal evolution in the northern Arabian-Nubian Shield. J Geol Soc London 144: 569–575
Stern RJ, Voegeli DA (1987) Geochemistry, geochronology, and petrogenesis of a Late Precambrian (= 590 Ma) composite dike from the North Eastern Desert of Egypt. Geol Rundsch 76: 325–341
Stern RJ, Gottfried D, Hedge CE (1984) Late Precambrian rifting and crustal evolution in the northeastern desert of Egypt. Geology 12: 168–172
Stoeser DB, Camp VE (1985) Pan-African microplate accretion of the Arabian Shield. Bull Geol Soc Am 96: 817–826
Streckeisen A (1976) To each plutonic rock its proper name. Earth Sci Rev 12: 1–33
Thompson RN, Morrison MA, Hendry GL, Parry SJ (1984) An assessment of the relative roles of a crust and mantle in the magma genesis: an elemental approach. Phil Trans R Soc London A310: 549–590
Wilkinson JFG (1982) The genesis of mid-ocean ridge basalt. Earth Sci Rev 18: 1–57
Willis KM, Stern RJ, Clauer N (1988) Age and geochemistry of late Precambrian sediments of the Hammamat series from the Northeastern Desert of Egypt. Precambrian Res 42: 173–187
Wilson M (1989) Igneous Petrogenesis: A Global Tectonic Approach. Allen & Unwin, London: 466 pp.
York D (1969) Least squares fitting of a straight line with correlated errors. Earth Planet Sci Lett 5: 320–324
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Correspondence to: H. Wachendorf
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Jarrar, G., Wachendorf, H. & Zachmann, D. A Pan-African alkaline pluton intruding the Saramuj Conglomerate, south-west Jordan. Geol Rundsch 82, 121–135 (1993). https://doi.org/10.1007/BF00563275
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DOI: https://doi.org/10.1007/BF00563275