OCEAN DRILLING PROGRAM July 1990 DATA FILE DOCUMENTATION IGNEOUS / METAMORPHIC ROCKS THIN SECTION DESCRIPTIONS I. INTRODUCTION The Thin Section Description data file contains the descriptions of thin section samples prepared from hardrock cores collected on the JOIDES Resolution. Each record in the data file contains the description of one thin section sample as written by the shipboard scientist. The descriptions include information about the phenocrysts, groundmass, vesicles, and secondary mineralogy of the rock. In some thin section descriptions, the scientists described primary and secondary mineralogy rather than phenocryst, groundmass and secondary mineralogy. This is especially true for Legs 103 and 104 where the paper form was designed to collect primary and secondary mineralogy data only. In the data file, if primary mineralogy was reported (rather than phenocrysts and groundmass), it is stored in the groundmass data items with the phenocrysts data items left blank. If you have problems or questions concerning these data, please contact: Data Librarian, Data Base Group Ocean Drilling Program Texas A&M University Research Park 1000 Discovery Drive College Station, Texas 77845-9547 U.S.A. (979) 845-8495, 845-2673 Easylink (Telex) Number: 62760290 Email: database@odpemail.tamu.edu Fax Number: 979-845-4857 II. LEGS IN THE DATA FILE The data file contains data from all Legs on which thin sections were prepared up to Leg 129. This includes Legs 103-104, 106, 109, 111-115, 118-121, 123-124, and 125-129. III. BIBLIOGRAPHY Shipboard Scientific Party, 1985. Explanatory Notes. In Anderson, R. N., Honnorez, J., Becker, K., et al., Initial Reports DSDP, 83: Washington (U.S. Government Printing Office), pp. 5-11. "Shipboard Scientist's Handbook", Ocean Drilling Program Technical Note #3, 1987. Explanatory Notes chapters, 1986 - present. In Proceedings of the Ocean Drilling Program, Initial Reports. IV. DATA ITEM FORMATS The following table lists the data items and their formats. For data requests other than on paper (ie. on magnetic tape), an accompanying sheet will contain any additional information needed to read the data. ITEMS FORMAT ============================================ ============== LEG Integer 3 SUBLEG Text 1 SITE Integer 4 HOLE Text 1 CORE Integer 3 CORETYPE Text 1 SECTION Text 2 TOP_INTERVAL Integer 3 BOTTOM_INTERVAL Integer 3 PIECE Integer 3 SUBPIECE Text 1 UNIT_NUMBER Integer 4 SUB_UNIT Text 1 OBSERVER Text 4 ROCKNAME Text 80 TEXTURE Text 100 WHERE_SAMPLED Text 40 GRAIN_SIZE Text 80 PHENOCRYSTS (up to 5 groups) OBSERVED Text 1 MINERAL_NAME Text 20 PRESENT_PERCENT Text 5 ORIGINAL_PERCENT Text 5 SIZE Text 11 COMPOSITION Text 50 MORPHOLOGY Text 50 COMMENTS Text 250 GROUNDMASS (up to 5 groups) OBSERVED Text 1 MINERAL_NAME Text 20 PRESENT_PERCENT Text 5 ORIGINAL_PERCENT Text 5 SIZE Text 11 COMPOSITION Text 50 MORPHOLOGY Text 50 COMMENTS Text 250 VESICLES (up to 3 groups) OBSERVED Text 1 TYPE_CODE Text 9 PERCENT Text 5 SIZE Text 11 LOCATION Text 20 FILLING Text 40 SHAPE Text 40 COMMENTS Text 250 SECONDARY MINERALIZATION (up to 8 groups) OBSERVED Text 1 MINERAL_NAME Text 20 PERCENT Text 5 REPLACEMENT Text 40 COMMENTS Text 250 MAIN_COMMENTS Text 1000 MORE_DATA Text 1 V. EXPLANATION OF DATA ITEMS LEG - Number identifying the cruise. The Ocean Drilling Program started numbering the cruises of the JOIDES Resolution at Leg 101. SUBLEG - Letter identifying a subleg or transit. A subleg is the continuation of a Leg after a port call; it often involves a crew change. SITE - Number identifying the site. A site is the position of a beacon around which holes are drilled. HOLE - Letter identifying the hole. CORE - Number identifying the core. Cores are numbered serially from the top of the hole downward. CORETYPE - A letter code identifying the drill bit/coring method used to retrieve the core. The coretype codes are: B - Drill Bit C - Center Bit D - Positive Displacement H - Hydraulic (Advanced) Piston Core M - Miscellaneous I - Interstitial Water Sample (used on Legs 101-116 only) N - Downhole Mud Motor (Navidrill) P - Pressure Core Barrel R - Rotary S - Side Wall Core W - Wash Core X - Extended Core Barrel SECTION - A core is cut into 1.5-meter-long sections that are numbered serially from the top of the core. A core with full recovery will have 7 sections and a core catcher and be approximately 9.8 meters long. TOP_INTERVAL - The location of the top of the interval from which the sample was taken, within a section in centimeters. BOTTOM_INTERVAL - The location of the bottom of the interval from which the sample was taken, within a section in centimeters. PIECE - Number identifying a rock piece within a section. A piece is one or a group of rock fragments that can be fitted together. SUBPIECE - Letter identifying the individual rock fragments within a piece. UNIT_NUMBER - Number of the lithologic unit. The core is subdivided into lithologic units, using the criteria of changing grain size, occurrence of glassy margins, and changes in petrographic type and phenocryst abundances. SUB_UNIT - Sub-unit letter of the lithologic unit. OBSERVER - Three or four letter code identifying the person who described the thin section. ROCKNAME - Rock name of unit being described. TEXTURE - Texture of rock sample. WHERE_SAMPLED - Geologic name of unit from which sample was taken. GRAIN_SIZE - Grain size of rock sample. PHENOCRYSTS: OBSERVED - One letter code indicating whether or not the description includes phenocrysts. "Y" = Yes, "N" = No. For internal use primarily. MINERAL_NAME - Name of the phenocryst mineral. PRESENT_PERCENT - Percent of the rock presently composed of this phenocryst. ORIGINAL_PERCENT - Percent of the rock originally composed of this phenocryst. SIZE - Size range of the phenocryst in mm. COMPOSITION - Approximate composition of this phenocryst. MORPHOLOGY - Morphology of this phenocryst. COMMENTS - Comments on the nature of these phenocryst. GROUNDMASS (or Primary Mineralogy if no Phenocrysts): OBSERVED - One letter code indicating whether or not the description includes groundmass. "Y" = Yes, "N" = No. For internal use primarily. MINERAL_NAME - Name of the groundmass (or primary mineralogy) mineral. PRESENT_PERCENT - Percent of the rock presently composed of the groundmass (or primary mineralogy) mineral. ORIGINAL_PERCENT - Percent of the rock originally composed of the groundmass (or primary mineralogy) mineral. SIZE - Size range in mm of the groundmass (or primary mineralogy) mineral. COMPOSITION - Approximate composition of the groundmass (or primary mineralogy) mineral. MORPHOLOGY - Morphology of the groundmass (or primary mineralogy) mineral. COMMENTS - Comments on the nature of the groundmass (or primary mineralogy). VESICLES: OBSERVED - One letter code indicating whether or not the description includes vesicles, etc. "Y" = Yes, "N" = No. For internal use primarily. TYPE_CODE - Name of the "vesicle" type. Includes: Vesicles, Cavities, Fractures, Veins, Voids. PERCENT - Percent of the rock composed of vesicles, etc. If the rock is non-vesicular, then "0%" is entered. SIZE - Size range, in mm, of the vesicles, etc. LOCATION - Location of the vesicles, etc. FILLING - Description of the filling of the vesicles, etc. SHAPE - Description of the shape or orientation of the vesicles, etc. COMMENTS - Comments on the nature of the vesicles, etc. SECONDARY MINERALIZATION: OBSERVED - One letter code indicating whether or not the description includes secondary mineralization. "Y" = Yes, "N" = No. For internal use primarily. MINERAL_NAME - Name of the secondary mineral. PERCENT - Percent of the rock which is composed of the secondary mineral. REPLACEMENT - Description of replacement or filling. COMMENTS - Comments on the secondary mineralization. MAIN_COMMENTS - Includes any additional observations or comments about the description or a particular data item. MORE_DATA - A "Y" (for "yes") indicates that more data or information was available on the paper, but could not be included in the data file, for example any additional diagrams drawn by the observer. RECORD FORMAT ON FILE FOR THE IGNEOUS / METAMORPHIC ROCKS THIN SECTION DESCRIPTION DATA SET COLUMN DATA ITEMS ON FILE =================================== ============== LEG 2-4 SUBLEG 5-5 SITE 6-9 HOLE 10-10 CORE 11-13 CORETYPE 14-14 SECTION 15-16 TOP_INTERVAL 17-19 BOTTOM_INTERVAL 20-22 PIECE 23-25 SUBPIECE 26-26 UNIT_NUMBER 27-30 SUB_UNIT 31-31 OBSERVER 32-35 ROCKNAME 36-115 TEXTURE 116-215 WHERE_SAMPLED 216-255 GRAIN_SIZE 256-335 PHENOCRYSTS.OBSERVED 336-336 PHENOCRYSTS.MIN_NAME(1) 337-356 PHENOCRYSTS.MIN_NAME(2) 357-376 PHENOCRYSTS.MIN_NAME(3) 376-396 PHENOCRYSTS.MIN_NAME(4) 396-416 PHENOCRYSTS.MIN_NAME(5) 417-436 PHENOCRYSTS.PRESENT_PERCENT(1) 437-441 PHENOCRYSTS.PRESENT_PERCENT(2) 442-446 PHENOCRYSTS.PRESENT_PERCENT(3) 447-451 PHENOCRYSTS.PRESENT_PERCENT(4) 452-456 PHENOCRYSTS.PRESENT_PERCENT(5) 457-461 PHENOCRYSTS.ORIGINAL_PERCENT(1) 462-466 PHENOCRYSTS.ORIGINAL_PERCENT(2) 467-471 PHENOCRYSTS.ORIGINAL_PERCENT(3) 472-476 PHENOCRYSTS.ORIGINAL_PERCENT(4) 477-481 PHENOCRYSTS.ORIGINAL_PERCENT(5) 482-486 PHENOCRYSTS.SIZE(1) 487-497 PHENOCRYSTS.SIZE(2) 498-508 PHENOCRYSTS.SIZE(3) 509-519 PHENOCRYSTS.SIZE(4) 520-530 PHENOCRYSTS.SIZE(5) 531-541 PHENOCRYSTS.COMPOSITION(1) 542-591 PHENOCRYSTS.COMPOSITION(2) 592-641 PHENOCRYSTS.COMPOSITION(3) 642-691 PHENOCRYSTS.COMPOSITION(4) 692-741 PHENOCRYSTS.COMPOSITION(5) 742-791 PHENOCRYSTS.MORPHOLOGY(1) 792-841 PHENOCRYSTS.MORPHOLOGY(2) 842-891 PHENOCRYSTS.MORPHOLOGY(3) 892-941 PHENOCRYSTS.MORPHOLOGY(4) 942-991 PHENOCRYSTS.MORPHOLOGY(5) 992-1041 PHENOCRYSTS.COMMENTS(1) 1042-1291 PHENOCRYSTS.COMMENTS(2) 1292-1541 PHENOCRYSTS.COMMENTS(3) 1542-1791 PHENOCRYSTS.COMMENTS(4) 1792-2041 PHENOCRYSTS.COMMENTS(5) 2042-2291 GROUNDMASS.OBSERVED 2292-2292 GROUNDMASS.MIN_NAME(1) 2293-2312 GROUNDMASS.MIN_NAME(2) 2313-2332 GROUNDMASS.MIN_NAME(3) 2333-2352 GROUNDMASS.MIN_NAME(4) 2353-2372 GROUNDMASS.MIN_NAME(5) 2373-2392 GROUNDMASS.PRESENT_PERCENT(1) 2393-2397 GROUNDMASS.PRESENT_PERCENT(2) 2398-2402 GROUNDMASS.PRESENT_PERCENT(3) 2403-2407 GROUNDMASS.PRESENT_PERCENT(4) 2408-2412 GROUNDMASS.PRESENT_PERCENT(5) 2413-2417 GROUNDMASS.ORIGINAL_PERCENT(1) 2418-2422 GROUNDMASS.ORIGINAL_PERCENT(2) 2423-2427 GROUNDMASS.ORIGINAL_PERCENT(3) 2428-2432 GROUNDMASS.ORIGINAL_PERCENT(4) 2433-2437 GROUNDMASS.ORIGINAL_PERCENT(5) 2438-2442 GROUNDMASS.SIZE(1) 2443-2453 GROUNDMASS.SIZE(2) 2454-2464 GROUNDMASS.SIZE(3) 2465-2475 GROUNDMASS.SIZE(4) 2476-2486 GROUNDMASS.SIZE(5) 2487-2497 GROUNDMASS.COMPOSITION(1) 2498-2547 GROUNDMASS.COMPOSITION(2) 2548-2597 GROUNDMASS.COMPOSITION(3) 2598-2647 GROUNDMASS.COMPOSITION(4) 2648-2697 GROUNDMASS.COMPOSITION(5) 2698-2747 GROUNDMASS.MORPHOLOGY(1) 2748-2797 GROUNDMASS.MORPHOLOGY(2) 2798-2847 GROUNDMASS.MORPHOLOGY(3) 2848-2897 GROUNDMASS.MORPHOLOGY(4) 2898-2947 GROUNDMASS.MORPHOLOGY(5) 2948-2997 GROUNDMASS.COMMENTS(1) 2998-3247 GROUNDMASS.COMMENTS(2) 3248-3497 GROUNDMASS.COMMENTS(3) 3498-3747 GROUNDMASS.COMMENTS(4) 3748-3997 GROUNDMASS.COMMENTS(5) 3998-4247 VESICLES.OBSERVED 4248-4248 VESICLES.TYPE_CODE(1) 4249-4257 VESICLES.TYPE_CODE(2) 4258-4266 VESICLES.TYPE_CODE(3) 4267-4275 VESICLES.PERCENT(1) 4276-4280 VESICLES.PERCENT(2) 4281-4285 VESICLES.PERCENT(3) 4286-4290 VESICLES.SIZE(1) 4291-4301 VESICLES.SIZE(2) 4302-4312 VESICLES.SIZE(3) 4313-4323 VESICLES.LOCATION(1) 4324-4343 VESICLES.LOCATION(2) 4344-4363 VESICLES.LOCATION(3) 4364-4383 VESICLES.FILLING(1) 4384-4423 VESICLES.FILLING(2) 4424-4463 VESICLES.FILLING(3) 4464-4503 VESICLES.SHAPE(1) 4504-4543 VESICLES.SHAPE(2) 4544-4583 VESICLES.SHAPE(3) 4584-4263 VESICLES.COMMENTS(1) 4624-4873 VESICLES.COMMENTS(2) 4874-5123 VESICLES.COMMENTS(3) 5124-5573 SECONDARY.MINERALIZATION.OBSERVED 5374-5374 SECONDARY.MIN_NAME(1) 5375-5394 SECONDARY.MIN_NAME(2) 5395-5414 SECONDARY.MIN_NAME(3) 5415-5434 SECONDARY.MIN_NAME(4) 5435-5454 SECONDARY.MIN_NAME(5) 5455-5474 SECONDARY.MIN_NAME(6) 5475-5494 SECONDARY.MIN_NAME(7) 5495-5514 SECONDARY.MIN_NAME(8) 5515-5534 SECONDARY.PERCENT(1) 5535-5539 SECONDARY.PERCENT(2) 5540-5544 SECONDARY.PERCENT(3) 5545-5549 SECONDARY.PERCENT(4) 5550-5554 SECONDARY.PERCENT(5) 5555-5559 SECONDARY.PERCENT(6) 5560-5564 SECONDARY.PERCENT(7) 5565-5569 SECONDARY.PERCENT(8) 5570-5574 SECONDARY.REPLACEMENT(1) 5575-5614 SECONDARY.REPLACEMENT(2) 5615-5654 SECONDARY.REPLACEMENT(3) 5655-5694 SECONDARY.REPLACEMENT(4) 5695-5734 SECONDARY.REPLACEMENT(5) 5735-5774 SECONDARY.REPLACEMENT(6) 5775-5814 SECONDARY.REPLACEMENT(7) 5815-5854 SECONDARY.REPLACEMENT(8) 5855-5894 SECONDARY.COMMENT(1) 5895-6144 SECONDARY.COMMENT(2) 6145-6394 SECONDARY.COMMENT(3) 6395-6644 SECONDARY.COMMENT(4) 6645-6894 SECONDARY.COMMENT(5) 6895-7144 SECONDARY.COMMENT(6) 7145-7394 SECONDARY.COMMENT(7) 7395-7644 SECONDARY.COMMENT(8) 7645-7894 MAIN_COMMENTS 7895-8894 MORE_DATA 8895-8895