APPENDIX III. COMPOSITION AND SOURCE OF DETRITAL SAND LAYERS FROM THE GUAYMAS BASIN J. Eduardo Aguayo> instituto Mexicano del Petróleo, Mexico, D.F., Mexico QAL 0 After: Geological chart, Instituto de Geologia, U.N. A.M., 9 N Sedimentary Rocks I QAL Quaternary (alluvium) j_~^_~i Upper Cretaceous I - I (marls and silts) I k Z~~l Jurassic (sandstone I I and pyroclastics) Igneous Rocks Plio Quaternary (basalts and andesites) Oligocene ocene (andesites and ignimbrites Rocks Complex Mesozoic (ophiolites) Precambrian to Tertiary (intrusives and metamorphics ] Pre-mesozoic rocks g (igneous, metamorphic, and sedimentary) 0 00 00 km W 0 Figure. Generalized distribution of lithological facies in northwest Mexico. Curray, J. R., Moore, D. G., et al., Init. Repts. DSDP, : Washington (U.S. Govt. Printing Office). 0
J. E. AGUAYO ple- i:«, Yaqui v fc SK Dark greenish gray (G /) medium sand, poorly sorted, fineskewed. Mz (0).. SKj +0. IRF 0 Hor Hyp 0 Oliv Apat Epid Mag Tit Mm Medium gray (N) coarse sandy silt, moderately sorted,.0 0. +0. 0 0 Note: Mz ( Φ ) = mean size; Vi = sorting; SK = skewness; Apat = apatite; = augite; Dol = dolomite; Epid = epidote; = feldspar; Hem = hematite; Hor = hornblende; Hyp = hypersthene; Mm = ilmenite; IRF = igneous rock fragments; Mag = magnetite; = mica; Oliv = olivine; Py = pyrite; = quartz; VG = volcanic glass; Zeol = zeolite; = diatoms; = radiolarians; = foraminifers; Sp Spic sponge spicules. Figure. Source areas of sediments deposited in the Guaymas Basin and textural attributes of Yaqui River sediments. 0
( COMPOSITION AND SOURCE OF DETRITAL SAND LAYERS 00- Water depth = 00 m, >. T" CO warn _ cφ I o D <0.- N <0.0- HOLE IT -- 9 < "" r' * < f 0. -Λ ^ v < < α g v Λ - > Λ < VΛ W r A P mm 9 mm 0 --Z-" i i A = Anhydrite P = Pyrite E = Epidote H= Hydrothermal sediment ^?=^ f-i-z f ; : > : : 00 ^ HOLE A UNIT I Olive brown diatom ooze and turbidites Coarse-grained dolerite sill UNIT II Dark dolomitic claystone Hydrothermally altered terrigenous turbidites and mud 'Number of turbidite beds per core..0 Bulk Density (g/cm ). (interval in cm) -, 00-0 Grayish olive (0Y/) sandy diatomaceous silt, very poorly sorted, strongly Mz(Φ).0 V I.0 SKj +0. Py Epid VG Horn Zeol Hem 0 Sp Spic A &, 0-0 9-,- Medium light gray (N ) very fine silty sand, poorly sorted, Medium gray (N) fine silty sand, very poorly..0.. +0. +0. 0 0 0 0 0 0 Figure. neralogical and textural attributes of terrigenous sediments from Holes and A. Locations given on stratigraphic column. Note s and are from hydrothermally altered sands. (See Fig. for explanation of symbols and abbreviations.) 09
J. E. AGUAYO HOLE Water depth = 99 m HOLEA 0 'Number of turbidite beds per core Bulk Density (g/cm ) (interval in cm) -,0- -, 9-9 -, - Grayish olive (0Y /) medium diatomaceous clayey silt, very poorly sorted, Grayish olive (0Y /) coarse diatomaceous clayey silt, strongly Grayish olive (0Y /) sandy diatomaceous clayey silt, very poorly sorted, fineskewed. MziΦ).0..0.0.. SK, +0. +0.0 +0.0 0 0 0 Py Hor Clay IRF 0 0 VG Others 0 0 0 Sp Spic -, - -, -0 -, 9 Grayish olive (0Y /) very fine silty sand, poorly sorted, strongly Grayish olive (0Y /) medium sandy silt, very poorly sorted, strongly Brown gray (YR /) medium sandy clayey silt, very poorly sorted, strongly......0 +0.0 +0. +0.0 0 0 0 0 0 Figure. neralogical and textural attributes of terrigenous sediments from Hole A. Note uniform source and abundance of feldspar. (See Fig. for explanation of symbols and abbreviations.) 0
Water depth - 9 SITE Ss * -,-0 Moderate olive brown (Y /) sandy diato- Mz(Φ>.0 V.. SK, +0. Py Clay 0 IRF 0 VG Hor Others maceous mud, very poorly sorted, fineskewed. -, - Medium gray (N) very fine.. +0. 0 0 0 clayey sand, poorly.,9- Medium dark gray (N). 0. +0. 0 0 sandy silt, moderately sorted, -,- Medium dark gray (N).. +0. 0 0 0 coarse clayey diatomaceous silt, poorly -, - Olive gray!y /) diato-. 0.90 +0. 0 0 clayey silt, moderately sorted, -B, - Olive gray (Y /) diato-.9. +0.0 0 maceous mud, poorly 9-,- Grayish olive (0Y /).. +0. 0 0 diatomaceous* clayey silt, poorly sorted, strongly 0-, -0 Grayish olive (0Y /).0. +0.0 0 0 diatomaceous clayey silt, poorly sorted, strongly 9 -,-9 Grayish olive HOY /)..9 +0. 0 coarse diatomaceous clayey silt, poorly 0 -. - Light gray very fine silty. 0. +0.0 0 0 sand, moderately sorted, SK, o t a -.9-9 Medium dark gray (N) very.. +0. 0 fine silty sand, poorly eludes % dolomite..0. Bulk Density (9/cm ) 'Number of turbidite beds per < Figure. neralogical and textural attributes of terrigenous sediments from Hole. (See Fig. for explanation of symbols and abbreviations.)
J. E. AGUAYO GUAYMAS BASIN SLOPE/OXYGEN MINIMUM ZONE SITE 0 SITE 9 W t r depth - m _ Water depth» m 00- < 0,000 yrj Laminated Homogeneous.0 Bulk Density (g/cm ) Hole 9 Hole Q (interval in cm) 9 -, - -, -9 -, 0-09 Moderate olive brown (Y /) and grayish (N) muddy diatomaceous ooze, poorly Olive gray (Y /) and grayish (N) clayey silt, moderately sorted, Dark greenish gray (G /) muddy fine sand, poorly Mz<Φ).0.0. V I.0 0.. SKj +0.0 +0. +0. 0 0 0 IRF 0 Py VG Hor Epid Apat Hyp Clay 0 0 0 Others 0 0 SpSpic a 0, CC 0-, 0 0-, 0-0 -,9-99 Olive gray (Y /) clayey silt, poorly sorted, strongly Medium gray (N) fine sand, poorly sorted, strongly Greenish gray (G /) very fine sand, poorly sorted, strongly Greenish gray (G /) fine sand, well-sorted, near symmetrical.....9.0.0. 0.9 +0. +0. +0. +0.0 0 0 0 0 0 0 0 0 a Also includes % hematite. Figure. neralogical and textural attributes of terrigenous sediments from Holes 9 and 0. Note predominance of feldspar. (See Fig. for explanation of symbols and abbreviations.)
COMPOSITION AND SOURCE OF DETRITAL SAND LAYERS Graphic mean: Mz= 0+ 00+ 0 Inclusive graphic standard deviation: V. = 0-0 + 09-0. = 0 + 0-00 0 +09-00 I (0-0) (09-0) Figure. Textural attributes of terrigenous sediments for all samples from the Guaymas Basin and from the Yaqui River. (Numbers refer to sample locations on lithology for Figures -.) Table. neral composition (total percent) for Leg sites in the Guaymas Basin. IRF VG Hor Epid Hyp Apat Oliv Zeol Mag Tit Ilm Py Hem Dol Sp Spic Clay Others 9 0 Yaqui River Yaqui River --, 00-0 cm A-^», 0-0 cm A-9-, - cm --, -0 cm --, - cm -A 9- cm --, - cm --, - cm --, - cm -9-, - cm -0-, -0 cm --, -9 cm --, - cm --, 9-9 cm A--, 0- cm A--, 9-99 cm A--, - cm A--, - cm A--, -0 cm A--, 9- cm 9--, - cm 9--, -9 cm 9--, 0-09 cm 0-.CC 0-0-, 0 cm 0-0-, 0- cm 0--, 9-99 cm 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Note: See Figure for explanations of abbreviations.