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Title: Discovery of Diamond in Eclogite from Chinese Continental Scientific Drilling Project Main Hole (CCSD-MH) in Sulu UHPM Belt


No abstract prepared.

; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
Report Number(s):
TRN: US201016%%1323
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Petrologica Sinica; Journal Volume: 23; Journal Issue: 12
Country of Publication:
United States
58 GEOSCIENCES; DIAMONDS; DRILLING; CHINA; national synchrotron light source

Citation Formats

Zhang,Z., Yang, J., Rong, H., Hu, J., Su, J., and Mao, H.. Discovery of Diamond in Eclogite from Chinese Continental Scientific Drilling Project Main Hole (CCSD-MH) in Sulu UHPM Belt. United States: N. p., 2007. Web.
Zhang,Z., Yang, J., Rong, H., Hu, J., Su, J., & Mao, H.. Discovery of Diamond in Eclogite from Chinese Continental Scientific Drilling Project Main Hole (CCSD-MH) in Sulu UHPM Belt. United States.
Zhang,Z., Yang, J., Rong, H., Hu, J., Su, J., and Mao, H.. Mon . "Discovery of Diamond in Eclogite from Chinese Continental Scientific Drilling Project Main Hole (CCSD-MH) in Sulu UHPM Belt". United States. doi:.
title = {Discovery of Diamond in Eclogite from Chinese Continental Scientific Drilling Project Main Hole (CCSD-MH) in Sulu UHPM Belt},
author = {Zhang,Z. and Yang, J. and Rong, H. and Hu, J. and Su, J. and Mao, H.},
abstractNote = {No abstract prepared.},
doi = {},
journal = {Acta Petrologica Sinica},
number = 12,
volume = 23,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
  • No abstract prepared.
  • Valles Caldera 1 (VC-1) is the first Continental Scientific Drilling Program (CSDP) core hole drilled in the Valles caldera and the first continuously cored well in the caldera region. The objectives of VC-1 were to penetrate a hydrothermal outflow plume near its source, to obtain structural and stratigraphic information near the intersection of the ring fracture zone and the precaldera Jemez fault zone, and to core the youngest volcanic unit inside the caldera (Banco Bonito obsidian). Coring of the 856-m well took only 35 days to finish, during which all objectives were attained and core recovery exceeded 95%. VC-1 penetratesmore » 298 m of moat volcanics and caldera fill ignimbrites, 35 m of precaldera volcaniclastic breccia, and 523 m of Paleozoic carbonates, sandstones, and shales. A previously unknown obsidian flow was encountered at 160 m depth underlying the battleship Rock Tuff in the caldera moat zone. Hydrothermal alteration is concentrated in sheared, brecciated, and fractured zones from the volcaniclastic breccia to total depth with both the intensity and rank of alterations increasing with depth. Alteration assemblages consist primarily of clays, calcite, pyrite, quartz, and chlorite, but chalcopyrite and sphalerite have been identified as high as 450 m and molybdenite has been identified in a fractured zone at 847 m. Carbon 13 and oxygen 18 analyses of core show that the most intense zones of hydrothermal alteration occur in the Madera Limestone above 550 m and in the Madera and Sandia formations below 700 m. This corresponds with zones of most intense calcite and quartz veining. Thermal aquifers were penetrated at the 480-, 540-, and 845-m intervals. Although these intervals are associated with alteration, brecciation, and veining, they are also intervals where clastic layers occur in the Paleozoic sedimentary rocks.« less
  • This report is a review and summary of the core drilling operations of the first Valles Caldera research borehole (VC-1) under the Thermal Regimes element of the Continental Scientific Drilling Program (CSDP). The project is a portion of a broader program that seeks to answer fundamental scientific questions about magma, rock/water interactions, and volcanology through shallow (<1-km) core holes at Long Valley, California; Salton Sea, California; and the Valles Caldera, New Mexico. The report emphasizes coring operations with reference to the stratigraphy of the core hole, core quality description, core rig specifications, and performance. It is intended to guide futuremore » research on the core and in the borehole, as well as have applications to other areas and scientific problems in the Valles Caldera. The primary objectives of this Valles Caldera coring effort were (1) to study the hydrogeochemistry of a subsurface geothermal outflow zone of the caldera near the source of convective upflow, (2) to obtain structural and stratigraphic information from intracaldera rock formations in the southern ring-fracture zone, and (3) to obtain continuous core samples through the youngest volcanic unit in Valles Caldera, the Banco Bonito rhyolite (approximately 0.1 Ma). All objectives were met. The high percentage of core recovery and the excellent quality of the samples are especially notable. New field sample (core) handling and documentation procedures were successfully utilized. The procedures were designed to provide consistent field handling of the samples and logs obtained through the national CSDP.« less
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