APPENDIX III. COMPOSITION AND SOURCE OF DETRITAL SAND LAYERS FROM THE GUAYMAS BASIN 1

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1 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) 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

2 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, 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

3 ( 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 &, ,- Medium light gray (N ) very fine silty sand, poorly sorted, Medium gray (N) fine silty sand, very poorly 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

4 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) SK, Py Hor Clay IRF 0 0 VG Others 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 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

5 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 clayey sand, poorly.,9- Medium dark gray (N) sandy silt, moderately sorted, -,- Medium dark gray (N) coarse clayey diatomaceous silt, poorly -, - Olive gray!y /) diato clayey silt, moderately sorted, -B, - Olive gray (Y /) diato maceous mud, poorly 9-,- Grayish olive (0Y /) diatomaceous* clayey silt, poorly sorted, strongly 0-, -0 Grayish olive (0Y /) diatomaceous clayey silt, poorly sorted, strongly 9 -,-9 Grayish olive HOY /) coarse diatomaceous clayey silt, poorly Light gray very fine silty sand, moderately sorted, SK, o t a Medium dark gray (N) very 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.)

6 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 SKj IRF 0 Py VG Hor Epid Apat Hyp Clay 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 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.)

7 COMPOSITION AND SOURCE OF DETRITAL SAND LAYERS Graphic mean: Mz= Inclusive graphic standard deviation: V. = = 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 Note: See Figure for explanations of abbreviations.

9. GRAIN-SIZE DISTRIBUTION FROM THE SOUTHEASTERN TIP OF BAJA CALIFORNIA AND GUAYMAS BASIN, MEXICO, DEEP SEA DRILLING PROJECT LEG 64 1

9. GRAIN-SIZE DISTRIBUTION FROM THE SOUTHEASTERN TIP OF BAJA CALIFORNIA AND GUAYMAS BASIN, MEXICO, DEEP SEA DRILLING PROJECT LEG 64 1 M. Gutierrez-Estrada, 2 Universidad Naciónal Autónoma de Mexico, Centro