scholarly journals Origin of the sheeted dike complex at superfast spread East Pacific Rise revealed by deep ocean crust drilling at Ocean Drilling Program Hole 1256D

2008 ◽  
Vol 9 (6) ◽  
pp. n/a-n/a ◽  
Author(s):  
Susumu Umino ◽  
Laura Crispini ◽  
Paola Tartarotti ◽  
Damon A. H. Teagle ◽  
Jeffery C. Alt ◽  
...  
Keyword(s):  
East Pacific Rise ◽  
Deep Ocean ◽  
Ocean Crust ◽  
Ocean Drilling Program ◽  
Ocean Drilling ◽  
East Pacific ◽  
Dike Complex ◽  
Sheeted Dike Complex

scholarly journals IODP Expedition 335: Deep Sampling in ODP Hole 1256D

2012 ◽  
Vol 13 ◽  
pp. 28-34 ◽  
Author(s):  
D. A. H. Teagle ◽  
B. Ildefonse ◽  
P. Blum ◽  
Keyword(s):  
Theoretical Models ◽  
Spreading Rate ◽  
Ocean Crust ◽  
Ocean Drilling Program ◽  
Drill Cuttings ◽  
Ocean Drilling ◽  
Ocean Ridges ◽  
Integrated Ocean Drilling Program ◽  
Geological Conditions ◽  
Ocean Lithosphere

Observations of the gabbroic layers of untectonized ocean crust are essential to test theoretical models of the accretion of new crust at mid-ocean ridges. Integrated Ocean Drilling Program (IODP) Expedition 335 ("Superfast Spreading Rate Crust 4") returned to Ocean Drilling Program (ODP) Hole 1256D with the intention of deepening this reference penetration of intact ocean crust a significant distance (~350 m) into cumulate gabbros. Three earlier cruises to Hole 1256D (ODP 206, IODP 309/312) have drilled through the sediments, lavas, and dikes and 100 m into a complex dike-gabbro transition zone. <br><br> Operations on IODP Expedition 335 proved challenging throughout, with almost three weeks spent re-opening and securing unstable sections of the hole. When coring commenced, the comprehensive destruction of the coring bit required further remedial operations to remove junk and huge volumes of accumulated drill cuttings. Hole-cleaning operations using junk baskets were successful, and they recovered large irregular samples that document a hitherto unseen sequence of evolving geological conditions and the intimate coupling between temporally and spatially intercalated intrusive, hydrothermal, contact-metamorphic, partial melting, and retrogressive processes. <br><br> Hole 1256D is now clean of junk, and it has been thoroughly cleared of the drill cuttings that hampered operations during this and previous expeditions. At the end of Expedition 335, we briefly resumed coring before undertaking cementing operations to secure problematic intervals. To ensure the greatest scientific return from the huge efforts to stabilize this primary ocean lithosphere reference site, it would be prudent to resume the deepening of Hole 1256D in the nearest possible future while it is open to full depth. <br><br> doi:<a href="http://dx.doi.org/10.2204/iodp.sd.13.04.2011" target="_blank">10.2204/iodp.sd.13.04.2011</a>

Petrology and geochemistry of the lower ocean crust formed at the East Pacific Rise and exposed at Hess Deep: A synthesis and new results

2002 ◽  
Vol 3 (11) ◽  
pp. 1-30 ◽  
Author(s):  
L. A. Coogan ◽  
K. M. Gillis ◽  
C. J. MacLeod ◽  
G. M. Thompson ◽  
R. Hékinian
Keyword(s):  
East Pacific Rise ◽  
Ocean Crust ◽  
East Pacific ◽  
Petrology And Geochemistry

scholarly journals Subsurface structure of a submarine hydrothermal system in ocean crust formed at the East Pacific Rise, ODP/IODP Site 1256

2010 ◽  
Vol 11 (10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Jeffrey C. Alt ◽  
Christine Laverne ◽  
Rosalind M. Coggon ◽  
Damon A. H. Teagle ◽  
Neil R. Banerjee ◽  
...  
Keyword(s):  
Hydrothermal System ◽  
East Pacific Rise ◽  
Subsurface Structure ◽  
Ocean Crust ◽  
East Pacific

scholarly journals Abiotic synthesis of graphite in hydrothermal vents

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Emily R. Estes ◽  
Debora Berti ◽  
Nicole R. Coffey ◽  
Michael F. Hochella ◽  
Andrew S. Wozniak ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Hydrothermal Vents ◽  
Direct Evidence ◽  
Settling Velocity ◽  
East Pacific Rise ◽  
Deep Ocean ◽  
Analytical Techniques ◽  
Filtration Method ◽  
East Pacific ◽  
Marine Organic Carbon

AbstractDeciphering the origin, age, and composition of deep marine organic carbon remains a challenge in understanding the dynamics of the marine carbon cycle. In particular, the composition of aged organic carbon and what allows its persistence in the deep ocean and in sediment is unresolved. Here, we observe that both high and low temperature hydrothermal vents at the 9° 50′ N; 104° 17.5 W East Pacific Rise (EPR) vent field are a source for (sub)micron-sized graphite particles. We demonstrate that commonly applied analytical techniques for quantification of organic carbon detect graphite. These analyses thereby classify graphite as either dissolved or particulate organic carbon, depending on the particle size and filtration method, and overlook its relevance as a carbon source to the deep ocean. Settling velocity calculations indicate the potential for these (sub)micron particles to become entrained in the buoyant plume and distributed far from the vent fields. Thus, our observations provide direct evidence for hydrothermal vents acting as a source of old carbon to the deep ocean.

scholarly journals Deep ocean circulation and transport where the East Pacific Rise at 9–10°N meets the Lamont seamount chain

2010 ◽  
Vol 115 (C12) ◽  
Author(s):  
J. W. Lavelle ◽  
A. M. Thurnherr ◽  
J. R. Ledwell ◽  
D. J. McGillicuddy ◽  
L. S. Mullineaux
Keyword(s):  
Ocean Circulation ◽  
East Pacific Rise ◽  
Deep Ocean ◽  
East Pacific ◽  
Seamount Chain ◽  
Deep Ocean Circulation
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