Academic Journal
A long in situ section of the lower ocean crust: results of ODP Leg 176 drilling at the Southwest Indian Ridge
| العنوان: | A long in situ section of the lower ocean crust: results of ODP Leg 176 drilling at the Southwest Indian Ridge |
|---|---|
| المؤلفون: | Henry J. B. Dick A, James H. Natl, Je¡rey C. Alt C, Wolfgang Bach C, Daniel Bideau C, Je¡rey S. Gee C, Sarah Haggas C, Jan G. H. Hertogen C, Greg Hirth C, Paul Martin Holm C, Benoit Ildefonse C, Gerardo J. Iturrino C, Barbara E. John C, Deborah S. Kelley C, Eiichi Kikawa C, Andrew Kingdon C, Petrus J. Leroux C, Jinichiro Maeda C, Peter S. Meyer C, D. Jay Miller D, H. Richard Naslund C, Yao-ling Niu C, Paul T. Robinson C, Jonathan Snow C, Ralph A. Stephen C, Patrick W. Trimby C, Horst-ulrich Worm C, Aaron Yoshinobu C |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://www.gm.univ-montp2.fr/spip/IMG/pdf/dick_EPSL_2000.pdf. |
| سنة النشر: | 1999 |
| المجموعة: | CiteSeerX |
| الوصف: | Ocean Drilling Program Leg 176 deepened Hole 735B in gabbroic lower ocean crust by 1 km to 1.5 km. The section has the physical properties of seismic layer 3, and a total magnetization sufficient by itself to account for the overlying lineated sea-surface magnetic anomaly. The rocks from Hole 735B are principally olivine gabbro, with evidence for two principal and many secondary intrusive events. There are innumerable late small ferrogabbro intrusions, often associated with shear zones that cross-cut the olivine gabbros. The ferrogabbros dramatically increase upward in the section. Whereas there are many small patches of ferrogabbro representing late iron- and titanium-rich melt trapped intragranularly in olivine gabbro, most late melt was redistributed prior to complete solidification by compaction and deformation. This, rather than in situ upward differentiation of a large magma body, produced the principal igneous stratigraphy. The computed bulk composition of the hole is too evolved to mass balance mid-ocean ridge basalt back to a primary magma, and there must be a significant mass of missing primitive cumulates. These could lie either below the hole or out of the section. Possibly the gabbros were emplaced by along-axis intrusion of moderately differentiated melts into the near-transform environment. Alteration occurred in three stages. High-temperature granulite- to |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.2898; http://www.gm.univ-montp2.fr/spip/IMG/pdf/dick_EPSL_2000.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.575.2898 http://www.gm.univ-montp2.fr/spip/IMG/pdf/dick_EPSL_2000.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.9CDE3F7 |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |