Geochemistry of Pliocene/Pleistocene basalts along the Central Anatolian Fault Zone (CAFZ), Turkey |
| |
| Institution: | 1. Çukurova Üniversitesi, Jeoloji Mühendisli?i Bölümü, 01330 Balcal?-Adana, Turkey;2. Department of Mineralogy, University of Geneva, 1211 Geneva, Switzerland;1. Unidade Acadêmica de Mineração e Geologia, Universidade Federal de Campina Grande, Campina Grande, Brazil;2. Programa de Pós-Graduação em Geologia, Universidade de Brasília, Brasília, Brazil;3. Programa de Pós-Graduação em Geologia, Universidade do Vale do Rio dos Sinos, São Leopoldo, Brazil;4. Research School of Earth Sciences, The Australian National University, Canberra, ACT 2601, Australia;5. Departamento de Física, Química e Matemática, Universidade Federal de São Carlos, Sorocaba, Brazil;6. Departamento de Física, Universidade Estadual Paulista, Presidente Prudente, Brazil;1. Helmholtz-Zentrum Potsdam, Deutsches GeoForschungsZentrum (GFZ) Potsdam, 14473 Potsdam, Germany;2. Institute of Geophysics, Polish Academy of Sciences, 01-452 Warsaw, Poland;3. Departamento de Ciencias Geologicas, Universidad Catolica del Norte, Avenida Angamos 0610, Antofagasta, Chile;1. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China;2. Geology and Geophysics Program, Missouri University of Science and Technology, Rolla, MO 65409, USA;1. Basins Research Group (BRG), Department of Earth Science and Engineering, Imperial College, London, SW7 2BP, UK;2. Department of Earth Science, University of Bergen, Allégaten 41, 5007 Bergen, Norway;3. Statoil ASA, Sandslihaugen 30, 5254 Sandsli, Norway |
| |
| Abstract: | Pliocene–Pleistocene volcanism accompanied strike-slip-related transtensional deformation along the K?z?l?rmak fault segment of the Central Anatolian fault zone (CAFZ) in the west of ?ark??la (Sivas–central Turkey). These volcanic rocks are represented by alkali olivine basalts. They can be divided into four different sub-groups on the basis of their Zr, Nb, TiO2 contents. A primitive mantle-normalized incompatible trace element diagram for four subgroups shows close similarity to typical OIB pattern. Some of the incompatible trace element ratios (Ce/Y, Zr/Nb, La/Ba, La/Nb) are also akin to OIB values. Highly fractionated REE patterns (La/YbN=24.7–9.2) with no Eu anomaly are the main features of the alkali basalts and are comparable to alkaline volcanism in continental rift zones. On the basis of Al2O3/TiO2, Nb/Y, Zr/Y Zr/Nb ratios, the geochemical differences among four sub-groups can be explained by variable degrees of partial melting of compositionally similar mantle source. Th/Nb, Th/Y, Nb/Y ratios and the primitive mantle-normalized trace element diagram suggests significant amount of crustal involvement for most of the alkali olivine basalts erupted along the CAFZ. Rupture of the continental lithosphere by strike-slip-related transtensional deformation might have caused decompressional partial melting of the asthenospheric mantle and generating alkali olivine basalts in this region. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
