Document Type : Original Research Paper

Authors

1 M.Sc., Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran

2 Associate Professor, Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran

3 Professor, Department of Geology, Faculty of Science, Shahid Bahonar University of Kerman, Kerman, Iran

Abstract

In the Pariz area, (Kerman province), there are special deposits and in the geological maps, they have introduced as detrital unconsolidated Neogene Conglomerates (Ng). Detailed field observations of these deposits in this study showed that they are pyroclastic deposits from the post Eocene unknown explosive eruptions. Stratigraphically, these units overlie the Eocene basaltic rocks, and their clasts are dacitic and rhyolitic in compositions, which means that they are completely different from the Eocene rocks. Genetically, these deposits are pyroclastic surges and flow deposits in association with the laharic units. Lithological features of these pyroclastics along with the absence of ducite or rhyolite lava flows and the relatively large dispersion of these deposits indicate that they have been formed by water bearing explosive eruptions. The clasts of these pyroclastic deposits contain plagioclase, amphibole, biotite and quartz and they are geochemically belong to the calcalkaline magmatic series. The geochemical characteristics of these rocks show that they formed in a post-collision environment and their geochemical nature are similar to the continental magmatic arc associations. These results are consistent with other studies on the post Eocene magmatic rocks of the Dehaj-Sardouieh belt.

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Main Subjects

References
Batchelor, R.A. and Bowden, P., 1985- Petrogenetic interpretation of granitoid rock series using multi-cationic parameters.Chemical geology, 48(1-4),43-55.DOI: 10.12691/jgg-6-2-4.
Boynton, W. V., 1984 - Cosmochemistry of the rare earth elements: meteorite studies, in rare earth element geochemistry. Elsevier, Amsterdam.
Cas, R. A. F. and Wright, J. V., 1987- Volcanic successions, modern and ancient,geological approach toprocesses, products and successions, Chapman and Hall, No,528.
Chekani Moghadam, M., Tahmasbi, Z., Ahmadi-Khalaji, A., Santos, J.F., 2018- Petrogenesis of Rabor-Lalehzar magmatic rocks (SE Iran): Constraints from whole rock chemistry and Sr-Nd isotopes, Geochemistry, 78(1), 58-77, DOI: 10.1016/j.chemer.2017.11.004.
Cox, K.J., Bell T.D. and Pankhurst, R.J., 1979- The interpretation of igneous rocks. Allen and Unwin, London. 450 p.
Dargahi, S., Arvin, M., Pan,.Y. and Babaei. A., 2010- Petrogenesis of post-collisional A-Type granitoids from The Urumieh–Dokhtar magmatic assemblage, Southwestern Kerman, Iran: Constraints on the Arabian–Eurasian Continental collision.Lithos. 115(1), 190-204. DOI: 10.1016/j.lithos.2009.12.002.
Dimitrijevic, M.D., 1973- Geology of Kerman region. Geol. Surv. Iran, Yu/52, 334p.
 
Fisher, R.V. and Schmincke , H.U., 1984- Pyroclastic rocks.Spring-verlag, 472P.
Hassanzadeh, J., 1993- Metallogenic and tectono-magmatic events in the SE sector of the Cenozoic active continental Margin of Iran (Shahr e Babak area, Kerman province), Ph.D. Thesis, Univ. CLA. USA, 204p.
Hole, M. J., Saunders, A. D., Marriner, G. F. and Tarney, J., 1984- Subduction of pelagic sediments: implications for Tte origin of Ce-anomalous basalts from the Mariana Islands. Journal of the Geological Society 141, no. 3: 453-472.
Irvine, T.N. and Baragar, W.R.A., 1971- A guide to the chemical classification of the Common volcanic rocks. Can. J. Earth. Sci, 8: 523-548, https://doi.org/10.1139/e71-055.
Karsli, O., Dokuz, A., Kandemir, R., Aydin, F., Alyıldız, C., 2019- Adakite-like parental melt generation by partial fusion of juvenile lower crust, Sakarya Zone, NE Turkey: A far-field response to break-off of the southern Neotethyan oceanic lithosphere, Lithos, 338-339: 58-72, doi.org/10.1016/j.lithos.2019.03.029.
Krauskopf, K. and Bird, D., 1995- Surface chemistry: the solution-mineral interface. Introduction to geochemistry (Ed MG-HI Editions) Mc Graw-Hill International Editions, Earth Sciences and Geology Series p: 135-163.
Li, B., Jiang, S.Y., Zhang, Q., Zhao, H.X. and Zhao, K.D., 2016- Geochemistry, geochronology and Sr–Nd–Pb– Hf isotopic compositions of Middle to late Jurassic syenite-granodiorites- dacite in south China: petrogenesis and tectonic implications, Gondwana Research, 35: 217-237, https://doi.org/10.1016/j.gr.2015.05.006.
Li, Q., Zhao, K.D., Lai, P.C., Jiang, S.Y. and Chen, W., 2018- Petrogenesis of Cretaceous Volcanic-Intrusive Complex from the giant Yanbei Tin Deposit, South China: Implication for Multiple Magma Sources, Tin Mineralization, and Geodynamic Setting, Lithos, 296-299, 163-180, DOI: 10.1016/j.lithos.2017.11.006.
Machado, A., Lima E. F., Chemale, J. F., Morta, D., Oteiza, O., Almeida, D. P . M., Figueiredo,  A., Urrutia, J. L., 2005- Geochemistry constraints of Mesozoic-Cenozoic calc-alkaline  magmatism in the South Shetland arc, Antarctica. J. South Amer. Earth Sci. 18:407-425, https://doi.org/10.1016/j.jsames.2004.11.011.
Maeno, F., Nakada, S., Yoshimoto, M., Shimano, T., Hokanishi, N., Zaennudin, A., Iguchi, M., 2019- A sequence of a plinian eruption preceded by dome destruction at Kelud volcano, Indonesia, on February 13, 2014, revealed from tephra fallout and pyroclastic density current deposits, Journal of Volcanology and Geothermal Research 382, 24–41, https://doi.org/10.1016/j.jvolgeores.2017.03.002.
Mazhari, S.A., Klötzli, U. and Safari, M., 2019- Petrological investigation of Late Cretaceous magmatism in Kaboodan area, NE Iran: Evidence for an active continental arc at Sabzevar zone, Lithos, 348-349, article 105183, https://doi.org/10.1016/j.lithos.2019.105183.
Miyabuchi, Y., Iizuka, Y., Hara, C., Yokoo, A., Ohkura, T., 2018-The September 14, 2015 phreatomagmatic eruption of Nakadake first crater, Aso Volcano, Japan: Eruption sequence inferred from ballistic, pyroclastic density current and fallout deposits, Journal of Volcanology and Geothermal Research, 351, 41-56, DOI: 10.1016/j.jvolgeores.2017.12.009.
Muller, D. and Groves, D.I., 1997- Potassic igneous and associated gold-copper Mineralization. Springer-Verlage, 241pp.
Nelson, S. T. and Montana, A., 1992- Seive-textured plagioclase in volcanic rocks produced by rapid   decompression: American Mineralogist. 77, 1242-1249.
Pearce, J. A., 1983- Role of the sub-continental lithosphere in magma genesis at active continental margins. In: Continental basalts and mantle xenoliths (Eds. Hawkesworth, C. J. and Norry, M. J.). Shiva, Nantwich,p:230-  249.
Shafiei, B., Haschke, M. and Shahabpour, J., 2009- Recycling of orogenic arc crust triggers porphyry Cu mineralization in Kerman Cenozoic arc rocks, southeastern Iran. Mineralium Deposita, 44, 265–283, DOI:10.1007/s00126-008-0216-0.
Sun, S. and MCDonough, W.F., 1989- Chemical and isotopic systematic of Ocean Basalts: Implications for mantle composition and processes. In: Sounders, A. D., Norry, M. J.   (Eds.), Magmatism in the ocean basins.Geological society, special publication, 42, 313- 345.
Whitney, D.L. and Evans, B.W., 2010- Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187, https://doi.org/10.2138/am.2010.3371.
Winchester, J.A. and Floyd, P. A., 1977- Geochemical discrimination of different magma series and their differentiation products using immobile elements. Chemical geology, 20:325-43.
Winter, J. D., 2001-An introduction to Igneous and Metamorphic Petrology. Prentice Hall. 697pp.