Rift evolution in regions of low magma input in East Africa
Rift evolution in regions of low magma input in East Africa
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东非低岩浆输入地区的裂谷演化
DOI：
10.1016/j.epsl.2018.11.004
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发表时间：
2019
影响因子：
5.3
通讯作者：
Scholz, Christopher A.
中科院分区：
文献类型：
--
作者：
Muirhead, James D.;Wright, Lachlan J.M.;Scholz, Christopher A.
岩浆活动通常被认为是在大陆裂谷发育过程中协助应变聚焦、推动岩石圈变薄和大陆破裂的关键因素。因此，东非裂谷系裂谷盆地演化模式以往主要集中在岩浆丰富的盆地；然而，要全面了解岩浆作用如何驱动裂谷演化，需要对岩浆丰富和岩浆贫乏的伸展环境进行分析。我们利用再处理的遗产和高分辨率商业地震反射数据集，研究了ear西部分支岩浆贫乏的坦噶尼喀湖裂谷断层发育的~ 1000万年历史。与岩浆丰富的东部分支不同，断层应变在裂谷发育的最初~ 1000万年内不会沿着裂谷轴集中到盆地底部。相反，大的裂谷边界断层（边界断层）容纳了从裂谷开始到现在的裂谷作用的大部分拉伸应变（在52公里宽的裂谷上估计11.5公里的延伸中约占90%）。ear的西部分支也以地壳结构和断层几何形状为特征，它们不同于成功裂陷的岩浆-贫边缘（例如，地壳中部分离的表状正断层）。在没有大量岩浆活动的情况下，我们认为：(1)在东西分支不可能实现完全的大陆破裂，或者(2)在西分支的大陆分裂将在与东部分支和岩浆缺乏的裂陷边缘形成对比的模式下进行。
Magmatism is often invoked as critical for assisting strain focusing during continental rift development, and in driving lithospheric thinning and continental rupture. Accordingly, models of rift basin evolution in the East African Rift System (EARS) have previously focused on magma-rich basins; however, a complete understanding of how magmatism drives rift evolution requires analyses of both magma-rich and magma-poor extensional environments. We investigate a ∼10-million-year history of fault development in the magma-poor Lake Tanganyika Rift of the Western branch of the EARS, utilizing reprocessed legacy and high-resolution commercial seismic reflection datasets. Unlike the magma-rich Eastern branch, fault-strain does not focus into the basin floor along the rift axis within the first ∼10 million years of rift development. Instead, large rift-bounding faults (border faults) accommodate the majority of extensional strain (∼90% of an estimated 11.5 km of extension over the 52 km-wide rift) from rift inception through to present-day rifting. The Western branch of the EARS is also characterized by crustal structure and fault geometries that differ from those observed for successfully rifted magma-poor margins (e.g., listric normal faulting with mid-crustal detachments). In the absence of voluminous magmatism, we suggest that either (1) complete continental rupture cannot be achieved in the Western branch of the EARS, or (2) continental break up in the Western branch will proceed under a model that contrasts with that invoked for both the Eastern branch and magma-poor rifted margins generally.
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影响因子：
3.3
作者：
D. Shillington;J. Gaherty;C. Ebinger;C. Scholz;K. Selway;A. Nyblade;P. Bedrosian;C. Class;S. Nooner;M. Pritchard;J. Elliott;P. Chindandali;G. Mbogoni;R. W. Ferdinand;N. Boniface;S. Manya;G. Kamihanda;E. Saria;G. Mulibo;J. Salima;A. Mruma;L. Kalindekafe;N. Accardo;D. Ntambila;M. Kachingwe;G. T. Mesko;T. McCartney;Melania Maquay;J. O’Donnell;G. Tepp;K. Mtelela;P. Trinhammer;D. Wood;E. Aaron;M. Gibaud;M. Rapa;C. Pfeifer;F. Mphepo;Duncan Gondwe;Gabriella B Arroyo;C. Eddy;Brian Kamoga;M. Moshi
通讯作者：
D. Shillington;J. Gaherty;C. Ebinger;C. Scholz;K. Selway;A. Nyblade;P. Bedrosian;C. Class;S. Nooner;M. Pritchard;J. Elliott;P. Chindandali;G. Mbogoni;R. W. Ferdinand;N. Boniface;S. Manya;G. Kamihanda;E. Saria;G. Mulibo;J. Salima;A. Mruma;L. Kalindekafe;N. Accardo;D. Ntambila;M. Kachingwe;G. T. Mesko;T. McCartney;Melania Maquay;J. O’Donnell;G. Tepp;K. Mtelela;P. Trinhammer;D. Wood;E. Aaron;M. Gibaud;M. Rapa;C. Pfeifer;F. Mphepo;Duncan Gondwe;Gabriella B Arroyo;C. Eddy;Brian Kamoga;M. Moshi
东非20公里以下地震及其对地壳结构的影响
DOI：
--
发表时间：
1995
期刊：
影响因子：
--
作者：
A. Nyblade;C. Langston
通讯作者：
C. Langston
通过地震反射数据分析比较坦噶尼喀、马拉维、鲁夸和图尔卡纳裂谷带
DOI：
--
发表时间：
1992
期刊：
影响因子：
--
作者：
B. Rosendahl;E. Kilembe;K. Kaczmarick
通讯作者：
K. Kaczmarick
影响因子：
2.4
作者：
G. Corti;M. Philippon;F. Sani;D. Keir;T. Kidane
通讯作者：
G. Corti;M. Philippon;F. Sani;D. Keir;T. Kidane
影响因子：
3.5
作者：
Agostini, Andrea;Corti, Giacomo;Mulugeta, Genene
通讯作者：
Mulugeta, Genene