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Natland, James H; Dick, Henry J B (2002): (Table T1) Olivine-gabbro sequence description of ODP Hole 118-735B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.787349, Supplement to: Natland, JH; Dick, HJB (2002): Stratigraphy and composition of gabbros drilled in Ocean Drilling Program Hole 735B, Southwest Indian Ridge: a synthesis of geochemical data. In: Natland, JH; Dick, HJB; Miller, DJ; Von Herzen, RP (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 176, 1-69, https://doi.org/10.2973/odp.proc.sr.176.002.2002

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Published: 2002 (exact date unknown)DOI registered: 2012-09-11

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Abstract:
Olivine gabbros, allied troctolitic gabbros, and troctolites, together making up the olivine gabbro suite, comprise some 76% of the section cored in Hole 735B on the eastern transverse ridge of the Atlantis II Fracture Zone, Southwest Indian Ridge. These rocks hold the keys to the processes of crustal accretion and magmatic differentiation beneath the floor of the rift valley. We develop the sequential stratigraphy of the olivine gabbro suite by itself, stripping out all later, crosscutting, usually more deformed, and more strongly differentiated oxide gabbros and felsic veins that comprise the remaining 24% of the section. The fundamental unit of crustal construction in the olivine gabbro suite appears as alternations in grain size that we term olivine gabbro sequences. Uniformly textured masses of coarse-grained olivine gabbro range from meters to tens of meters thick and alternate with finer-grained and usually more olivine-rich rocks that have higher Mg# and Ni, such as troctolite and microtroctolite. There are 97 such sequences in the core. However, only 35 are more than 10 m thick and contribute substantially to the section. Several sequences are >40 m thick, and one is 120 m thick. We consider that each sequence represents either a single pulse of magma, in which olivine tended to concentrate toward the base during injection, or several pulses of magma, mostly marked by sutured, interpenetrative igneous contacts and small changes in grain size, but all injected quickly and at one place in the section.
Project(s):
Coverage:
Latitude: -32.724000 * Longitude: 57.266200
Date/Time Start: 1987-12-06T04:45:00 * Date/Time End: 1987-12-11T01:00:00
Minimum DEPTH, sediment/rock: 28.200 m * Maximum DEPTH, sediment/rock: 1471.980 m
Event(s):
118-735B * Latitude: -32.724000 * Longitude: 57.266200 * Date/Time Start: 1987-12-06T04:45:00 * Date/Time End: 1987-12-11T01:00:00 * Elevation: -731.0 m * Penetration: 500.7 m * Recovery: 434.81 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg118 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 88 cores; 500.7 m cored; 0 m drilled; 86.8 % recovery
Comment:
DEPTH, sediment is given in mbsf.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Sample code/labelSample labelNatland, James HDSDP/ODP/IODP sample designation
Lithologic unit/sequenceUnitNatland, James Hseries
ZoneZoneNatland, James H
Lithologic unit/sequenceUnitNatland, James Hsequence no.
Lithologic unit/sequenceUnitNatland, James Hinterval
Depth, bathymetricBathy depthmNatland, James Hcurated depth [mcd]
DEPTH, sediment/rockDepth sedmGeocode
Depth, top/minDepth topmNatland, James Hof sequence
Depth, bottom/maxDepth botmNatland, James Hof sequence
10 Lake, lengthLake lmNatland, James Hof sequence
11 Layer thicknessThicknessmNatland, James Hof sequence
12 Cumulative thicknessCum thickmNatland, James H
13 Grain size descriptionGrain size descrNatland, James H
14 DescriptionDescriptionNatland, James Hmodifier
15 Rock typeRockNatland, James H
16 DescriptionDescriptionNatland, James Hspecial modifier
17 Layer thicknessThicknessmNatland, James Hof basal interval
18 ParameterParameterarbitrary unitsNatland, James Hinterval contacts
Size:
1453 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Sample label

Unit
(series)

Zone

Unit
(sequence no.)

Unit
(interval)

Bathy depth [m]
(curated depth [mcd])

Depth sed [m]

Depth top [m]
(of sequence)

Depth bot [m]
(of sequence)
10 
Lake l [m]
(of sequence)
11 
Thickness [m]
(of sequence)
12 
Cum thick [m]
13 
Grain size descr
14 
Description
(modifier)
15 
Rock
16 
Description
(special modifier)
17 
Thickness [m]
(of basal interval)
18 
Parameter [arbitrary units]
(interval contacts)
118-735B-13R-2114-44110.028.2008.1948.2140.0219.1419.14OlivineMicrogabbro0.861
118-735B-16R-51246-5160.057.64048.3266.9618.6418.4237.56OlivineMicrogabbro0.321
118-735B-18R-31352-6158.070.08066.9673.206.245.7643.32OlivineMicrogabbro0.462
118-735B-19R-51462-75140.078.93073.6684.2010.548.9452.26TroctoliticMicrogabbro0.212
118-735B-20R-11576-7725.084.38584.2084.570.370.3752.63TroctoliticMicrogabbro0.212
118-735B-20R-11678-80105.085.17084.5785.771.201.1053.73TroctoliticMicrogabbro0.051
118-735B-21R-11781-860.087.48585.7789.203.432.5756.30TroctoliticMicrogabbro0.12
118-735B-22R-31887-92123.094.12089.2099.049.849.3865.68TroctoliticMicrogabbro0.152
118-735B-23R-21993-9645.0100.27099.04101.502.462.1467.82OlivineMicrogabbro0.071
118-735B-24R-111098-10383.0103.930101.54106.324.783.1670.98OlivineMicrogabbro0.091
118-735B-26R-1111104-11983.0111.325106.32116.3310.018.8879.86OlivineMicrogabbro0.23
118-735B-26R-1112120-121144.0116.635116.33116.940.610.6180.47OlivineMicrogabbro0.08
118-735B-28R-4113122-139122.0124.100116.94131.2614.3212.5292.99OlivineMicrogabbro0.15
118-735B-30R-3114140-15135.0135.510131.26139.768.507.26100.25OlivineMicrogabbro1.36
118-735B-31R-4115152-16312.0143.570139.76147.387.627.22107.47OlivineMicrogabbro0.261
118-735B-31R-4116164-16554.0147.570147.38147.760.380.38107.85OlivineMicrogabbro0.111
118-735B-36R-1117166-184148.0160.120147.76172.4824.7222.58130.43TroctoliticMicrogabbro0.082
118-735B-39R-3118185-209144.0181.405172.48190.3317.854.57135.00OlivineMicrogabbro0.651
118-735B-45R-3119214-26799.0221.715212.11231.327.115.73140.73TroctoliticMicrogabbro0.321
118-735B-76R-2220287-31634.0334.650273.73395.57176.35120.73261.46OlivineMicrogabbro0.148
118-735B-79R-5221317-375101.0408.345395.71420.9825.2716.19277.65TroctoliticMicrogabbro0.252
118-735B-79R-7222377-383A114.0422.450421.03423.872.840.81278.46OlivineMicrogabbroPatchy0.44
118-735B-80R-2223384A-39458.0423.855421.82425.894.073.13281.59Troctolite0.443
118-735B-80R-4224395-40342.0427.170425.89428.452.561.42283.01TroctoliticMicrogabbro0.12
118-735B-82R-2225404-43427.0436.660428.45444.8716.6211.57294.58TroctoliticMicrogabbro1.18
118-735B-83R-4226438-446134.0451.370445.23457.5111.986.13300.71MediumOlivineGabbro0.24
118-735B-83R-6227448-448B24.0458.605458.18459.030.850.77301.48MediumOlivineGabbro0.08
118-735B-83R-7228450-451A18.0459.765459.24460.291.050.66302.14MediumOlivineGabbro0.53
118-735B-83R-822945237.0461.025460.29461.761.471.47303.61MediumTroctolite1.47
118-735B-85R-7230452c-465A60.0472.040464.22479.8615.646.51310.12MediumOlivineGabbro1.511
118-735B-85R-8231466-46822.0480.255479.86480.650.790.78310.90MediumTroctoliticGabbro0.192
118-735B-86R-5232469-475B56.0483.945480.66487.236.573.75314.65MediumOlivineGabbro0.87
118-735B-87R-4233476-48422.0491.220487.23495.217.984.14318.79FineOlivineGabbro0.25
118-735B-87R-7234484A-491B8.0497.355495.21499.504.291.05319.84FineOlivineGabbro0.041
118-735B-88N-1235493-4944.0499.950499.50500.400.900.54320.38FineOlivineGabbroLeucocratic0.01
118-735B-89R-2236495-49612.0503.325500.04506.616.576.57326.95MediumOlivineGabbroLeucocratic0.18
118-735B-90R-4237497A-497B110.0509.645506.61512.686.076.06333.01MediumTroctoliticGabbro0.02
118-735B-90R-8238499-50256.0514.665512.70516.633.933.89336.90FineOlivineGabbroLeucocratic0.422
118-735B-91R-2239503-50445.0518.330516.63520.033.403.40340.30FineOlivineGabbro1.732
118-735B-96R-1240505-52385.0535.140520.03550.2530.226.54346.84FineOlivineGabbro0.181
118-735B-107R-13A41536-55066.0604.285588.19620.3832.1921.58368.42MediumOlivineGabbro11.90
118-735B-109R-23A42556-558102.0627.060623.01631.118.108.10376.52MediumOlivineGabbro0.642
118-735B-120R-13A43560-59226.0670.880631.50710.2678.7627.96404.48FineOlivineGabbro0.15
118-735B-3A4459377.0710.510710.26710.760.500.50404.98MediumOlivineGabbro0.50
118-735B-120R-13A45597-60226.0715.720711.50719.948.447.20412.18FineOlivineGabbro0.223
118-735B-121R-13A46603-606105.0720.985719.94722.032.091.84414.02FineOlivineMicrogabbro0.783
118-735B-121R-23A47607-60810.0722.255722.03722.480.450.45414.47FineOlivineMicrogabbro0.182
118-735B-121R-33A48609-61021.0723.870722.48725.262.782.77417.24FineOlivineMicrogabbro0.302
118-735B-121R-53A49611-61336.0725.880725.26726.501.241.17418.41MediumOlivineGabbro0.17
118-735B-121R-63A50615-621108.0735.420726.63744.2117.5816.57434.98FineOlivineGabbro0.331
118-735B-123R-43A51622-62729.0754.740744.21765.2721.0620.63455.61FineOlivineMicrogabbro0.104
118-735B-127R-13A52628-62995.0771.550765.27777.8312.5612.56468.17FineOlivineMicrogabbro0.352
118-735B-128R-23A53630-63125.0778.395777.83778.961.131.13469.30FineOlivineMicrogabbro0.881
118-735B-128R-363590.0782.565778.96786.171.78
118-735B-129R-13A54632-63590.0782.565778.96786.177.211.35470.65MediumOlivineGabbro0.242
118-735B-129R-43A55636-638-714.0789.860786.17793.557.387.38478.03FineOlivineMicrogabbro1.071
118-735B-130R-13A56638-64147.0794.095793.55794.641.091.09479.12FineOlivineMicrogabbro0.163
118-735B-130R-33A57642-64323.0796.605794.64798.573.933.93483.05FineOlivineMicrogabbro0.171
118-735B-130R-33A58644-645118.0799.320798.57800.071.501.49484.54MediumOlivineGabbro0.881
118-735B-133R-43A59646-66433.0813.850800.07827.6327.5613.50498.04MediumOlivineGabbro0.56
118-735B-134R-73A60666-668138.0834.705827.47841.9414.4714.25512.29GradedOlivineGabbro12.631
118-735B-137R-23A61669-67768.0847.695841.94853.4511.5110.69522.98GradedOlivineGabbro1.611
118-735B-137R-73A62679-6823.0856.605853.53859.686.156.07529.05FineOlivineMicrogabbroLeucocratic0.172
118-735B-139R-13A63683-685130.0866.030859.68872.3812.7012.61541.66MediumOlivineGabbro0.71
118-735B-144R-13A64687-693131.0893.110872.60913.6241.0240.51582.17GradedOlivineGabbro19.78
118-735B-145R-53A65695-70320.0920.750913.80927.7014.1013.85596.02GradedOlivineGabbro6.022
118-735B-148R-13A66705-713108.0942.025932.09951.9619.8724.26620.28FineOlivineGabbro7.62
118-735B-149R-23A67716-71759.0957.325952.36962.299.939.66629.94FineOlivineGabbro1.101
118-735B-153R-13B68718-72064.0979.335962.29996.3834.0934.09664.03FineOlivineMicrogabbro0.551
118-735B-153R-73B69721-72624.01000.275996.381004.177.797.79671.82FineOlivineMicrogabbro0.066
118-735B-155R-43B70727-732108.01012.2701004.171020.3716.2016.20688.02GradedOlivineGabbro4.001
118-735B-156R-63B71733-741128.01026.1451020.371031.9211.5511.55699.57MediumOlivineGabbro1.222
118-735B-158R-23B72743-76636.01039.0251032.491045.5613.0713.07712.64MediumOlivineGabbro0.441
118-735B-161R-43B73768-789109.01061.7651045.611077.9232.3132.36745.00MediumOlivineGabbro0.242
118-735B-162R-83B74790-79739.01084.6701077.921091.4213.5013.50758.50MediumOlivineGabbro0.224
118-735B-164R-13B75798-80017.01095.5151091.421099.618.198.18766.68FineOlivineMicrogabbro0.212
118-735B-165R-33B76802-805120.01103.7101099.661107.768.108.06774.74FineOlivineMicrogabbro0.181
118-735B-165R-43B77806-80886.01108.1351107.761108.510.750.71775.45FineOlivineMicrogabbroLeucocratic0.712
118-735B-170R-73B78810-81768.01132.8451108.511157.1848.6736.27811.72FineOlivineMicrogabbro0.94
118-735B-175R-33B79819-83373.01175.8301157.501194.1636.6634.30846.02VariableOlivineGabbro1.42
118-735B-178R-73C80835-83825.01206.8801194.261219.5025.2425.19871.21FineMicrotroctoliteLeucocratic0.382
118-735B-183R-23C81839-86430.01240.5651219.501261.6342.1338.49909.70FineOlivineMicrogabbro0.2614
118-735B-189R-43C82865-88216.01291.2251261.631320.8259.2056.63966.33VariableMicrotroctoliteandMicrogabbro1.289
118-735B-189R-63C83883-88410.01322.1401320.821323.462.642.63968.96VariableOlivineMicrogabbro1.652
118-735B-190R-33C84885-88861.01326.5701323.461329.686.226.09975.05MediumOlivineGabbro1.861
118-735B-190R-73C85890-89122.01332.5701329.901335.245.345.34980.39VariableTroctoliticGabbro0.562
118-735B-191R-33C86892-895108.01337.4351335.241339.634.394.29984.68FineTroctoliticMicrogabbro4.292
118-735B-191R-43C87896-89718.01339.8901339.631340.150.520.52985.52FineTroctoliticMicrogabbro0.212
118-735B-192R-23C88898-899117.01344.7751340.151349.409.259.25994.45FineOlivineGabbro0.162
118-735B-194R-33C89900-90334.01356.3801349.401363.3613.7613.961008.41FineTroctoliticMicrogabbro0.214
118-735B-195R-53C90904-90536.01366.3001363.361369.245.885.881014.29CoarseLeucocraticGabbro0.722
118-735B-196R-33C91906-90899.01373.0251369.241376.817.577.571021.86FineTroctoliticMicrogabbro0.313
118-735B-198R-13C92909-91229.01381.7501376.811386.6910.389.881031.74FineMicrotroctolite0.211
118-735B-198R-23C93913-9145.01387.2801386.691387.871.181.181032.92FineTroctoliticMicrogabbro0.032
118-735B-203R-13C94915-9215.01409.3601387.871430.8543.0842.981075.90FineTroctoliticMicrogabbro1.204
118-735B-205R-63C95923-93295.01444.3401430.931457.7526.8226.821102.72MediumOlivineGabbro0.6010
118-735B-208R-63C96933-948110.01471.9801457.751486.2128.4628.461131.18FineOlivineGabbro0.1514