Deep seismic reflection profile DEKORP 1990-3B/MVE (West) from the Kellerwald to the Bohemian Massif, West Germany

The 208 km long profile 3B/MVE (West) was recorded in 1990 as part of the joint seismic reflection venture DEKORP 1990-3/MVE (Muenchberg-Vogtland-Erzgebirge) between the two former German Republics shortly before their unification. The aim of DEKORP 1990-3/MVE was to explore the structure of the crust from the Rhenish Shield through the Bohemian Massif to the Ore Mountains. The entire profile consists of DEKORP 3A, DEKORP 3B/MVE (West) and its prolongation to the east DEKORP 3B/MVE (East). Its total length amounts to about 600 km. 24 short seismic cross lines and associated 3D blocks with single fold coverage were also recorded. The seismic survey of 3B/MVE (West) was performed to investigate the deep crustal structure and the transition zone between the Rhenohercynian and Saxothuringian units with high-fold near-vertical incidence vibroseis acquisition. The results were compared with the results from the surveys DEKORP 1 and DEKORP 2, running nearly parallel to the line 3B/MVE (West). Details of the 3B/MVE (West) experiment, its preliminary results and interpretations may be obtained from DEKORP Research Group (A) et al. (1994) and DEKORP Research Group (C) et al. (1994). The Technical Report of line 3B/MVE (West) gives complete information about acquisition and processing parameters. The European Variscides, extending from the French Central Massif to the East European Platform, originated during the collision between Gondwana and Baltica in the Late Palaeozoic. Due to involvement of various crustal blocks in the orogenesis, the mountain belt is subdivided into distinct zones. The external fold-and-thrust belts of the Rhenohercynian and Saxothuringian as well as the predominantly crystalline body of the Moldanubian dominate the central European segment of the Variscides. Polyphase tectonic deformation, magmatism and metamorphic processes led to a complex interlinking between the units. The mainly NW-SE running DEKORP 3B/MVE (West) runs perpendicular to the Variscan strike direction and traverses the southern part of the Rhenohercynian unit with the Northern Phyllite Zone and the northern part of the Saxothuringian unit including the Mid-German Crystalline High. Starting in the Kellerwald the profile crosses the Hessian Depression, the Tertiary volcanic Rhoen Mountains and the Mesozoic of the Franconian Basin (DEKORP Research Group (C) et al., 1994). East of Staffelstein the profile turns to the east and ends on the Franconian Line, the southwestern boundary fault zone of the Bohemian Massif. The line 3B/MVE (West) is intersected by ten cross lines along the profile and by DEKORP 3A at its northwestern end. To the east the profile is extended by DEKORP 3B/MVE (East).

长208公里的3B/MVE（西）剖面于1990年采集，是两德统一前夕原德意志民主共和国与联邦德国联合开展的DEKORP 1990-3/MVE（明希贝格-福格特兰-厄尔士山脉）地震反射勘探项目的一部分。DEKORP 1990-3/MVE的目标是探究从莱茵地盾（Rhenish Shield）经波希米亚地块（Bohemian Massif）至厄尔士山脉（Ore Mountains）的地壳结构。整个剖面由DEKORP 3A、DEKORP 3B/MVE（西）及其向东延伸段DEKORP 3B/MVE（东）组成，总长度约600公里。24条短地震测线及相关单叠覆盖三维区块也被同步采集。

3B/MVE（西）地震勘探采用高叠近垂直入射可控震源采集技术，旨在探究莱茵海西造山带（Rhenohercynian）与萨克森图林根造山带（Saxothuringian）单元之间的深部地壳结构及过渡带。其结果与近乎平行于3B/MVE（西）测线的DEKORP 1和DEKORP 2勘探结果进行了对比。3B/MVE（西）实验的细节、初步结果及解释可参见DEKORP研究组（A）等（1994）与DEKORP研究组（C）等（1994）的研究；该测线的技术报告提供了采集与处理参数的完整信息。

欧洲华力西造山带（Variscides）从法国中央地块延伸至东欧地台，形成于晚古生代冈瓦纳大陆（Gondwana）与波罗的大陆（Baltica）碰撞期间。由于多块地壳单元参与造山作用，该山带被划分为不同区域。莱茵海西造山带（Rhenohercynian）与萨克森图林根造山带（Saxothuringian）的外部褶皱冲断带，以及以结晶岩为主的摩尔达努比造山带（Moldanubian），构成了华力西造山带中欧段的主体。多期构造变形、岩浆活动及变质作用导致各单元间形成复杂的相互联系。

大致呈西北-东南走向的DEKORP 3B/MVE（西）测线垂直于华力西构造走向（Variscan strike direction），穿越莱茵海西造山带单元南部（含北千枚岩带（Northern Phyllite Zone））及萨克森图林根造山带单元北部（含中德结晶高地（Mid-German Crystalline High））。剖面始于凯勒瓦尔德（Kellerwald），穿越黑森坳陷（Hessian Depression）、第三纪火山罗恩施山脉（Rhoen Mountains）及弗兰肯盆地（Franconian Basin）中生代地层（DEKORP研究组（C）等，1994）。在施塔费尔施泰因（Staffelstein）以东，剖面转向东，终止于弗兰肯线（Franconian Line）——波希米亚地块（Bohemian Massif）西南边界断裂带。

3B/MVE（西）测线沿剖面方向与10条测线相交，其西北端与DEKORP 3A测线交汇；向东则延伸为DEKORP 3B/MVE（东）测线。