Geochronology and petrogenesis of hornblende-bearing basalts (Rhön, Germany) - remnants of volcanic rocks from the lithospheric upper mantle)

含角闪石玄武岩的地质年代学和岩石成因（德国罗恩）——岩石圈上地幔火山岩的残余物）

• 批准号: 106887825
• 负责人: Professor Dr. Stefan Jung
• 金额: --
• 依托单位: Mineralogisch-Petrographisches Institut (MPI)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/106887825?language=en
• 关键词: Geochronology; petrogenesis; hornblende; bearing; basalts

The proposed project deals with the geochronology, geochemistry and isotope composition of alkali olivine basalts s. /. that represent a significant part of the volcanic rocks in the Rhön area (Germany). In contrast to other volcanic occurrences in central Europe, most of these alkaline volcanic rocks contain mm- to cm-sized hornblende phenocrysts beside clinopyroxene (some with green cores) and olivine. Based on these unusual mineralogical composition and some geochemical features, i.e. high TiO2 contents > 3.0 wt%, it can be suggested that the hornblendebearing basalts originate from sources distinct to those envisaged for other alkaline rocks from central Europe, i.e. probably representing melts of the subcrustal lithospheric mantle. The volcanic rocks will be investigated for Nd, Sr, Pb, Hf, Os and O whole rock isotopes and the major and trace element composition of the hornblende phenocrysts will be determined by using an electron microprobe and an ionprobe. Ar-Ar age determinations on hornblende phenocrysts will complement the isotope data. In addition, it is planned to analyse the hornblende phenocrysts for Nd, Sr, Pb and O isotopes. Results obtained during this study will place constraints on possible heterogeneities of the upper mantle in rift-related areas and can also be used to distinguish second order processes (crustal contamination with or without fractional crystallization, magma mixing) from first order processes (partial melting of spinel or garnet peridotite with or without OH-bearing minerals etc.). The project is therefore ideally suited to add knowledge on lithosphere dynamics in rift-related continental setting.

拟议的项目涉及rhön地区火山岩的一部分（德国）。 ，即高tio2含量> 3.0 wt％，可以将其刺激性的玄武岩来自中欧岩石层的碱性岩石的不同来源。 OS和Osopopes以及Themocrysts的主要和痕量元素组成将使用probrobe和interobe确定。研究将在与裂谷相关区域的上层可能的异质性上施加限制矿物质等）。

项目成果

Amphibole in alkaline basalts from intraplate settings: implications for the petrogenesis of alkaline lavas from the metasomatised lithospheric mantle

• DOI: 10.1007/s00410-014-0989-3
• 发表时间: 2014-03
• 期刊: Contributions to Mineralogy and Petrology
• 影响因子: 3.5
• 作者: Bernhard Mayer;Bernhard Mayer;Stefan Jung;Rolf L. Romer;J. Pfänder;A. Klügel;Andreas Pack;E. Gröner

Petrogenesis of Tertiary Hornblende-bearing Lavas in the Rhön, Germany

德国罗恩河第三纪含角闪石熔岩的岩石成因

• DOI: 10.1093/petrology/egt042
• 发表时间: 2013
• 期刊: Journal of Petrology
• 影响因子: 3.9
• 作者: Stracke;Garbe-Schönberg
• 通讯作者: Garbe-Schönberg