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Fryer, Patricia B; Mottl, Michael J (1992): Mineralogy of serpentine muds of ODP Leg 125 holes (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.763152, Supplement to: Fryer, PB; Mottl, MJ (1992): Lithology, mineralogy, and origin of serpentine muds recovered from Conical and Torishima Forearc Seamounts: Results of Leg 125 drilling. In: Fryer, P; Pearce, JA; Stokking, LB; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 125, 343-362, https://doi.org/10.2973/odp.proc.sr.125.126.1992

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Abstract:
Large serpentinite seamounts are common in the forearc regions between the trench axis and the active volcanic fronts of the Mariana and Izu-Bonin intraoceanic arcs. The seamounts apparently form both as mud volcanoes, composed of unconsolidated serpentine mud flows that have entrained metamorphosed ultramafic and mafic rocks, and as horst blocks, possibly diapirically emplaced, of serpentinized ultramafics partially draped with unconsolidated serpentine slump deposits and mud flows. The clayand silt-sized serpentine recovered from three sites on Conical Seamount on the Mariana forearc region and from two sites on Torishima Forearc Seamount on the Izu-Bonin forearc region is composed predominantly of chrysotile, brucite, chlorite, and clays. A variety of accessory minerals attest to the presence of unusual pore fluids in some of the samples. Aragonite, unstable at the depths at which the serpentine deposits were drilled, is present in many of the surficial cores from Conical Seamount. Sjogrenite minerals, commonly found as weathering products of serpentine resulting from interaction with groundwater, are found in most of the samples. The presence of aragonite and carbonate-hydroxide hydrate minerals argues for interaction of the serpentine deposits with fluids other than seawater.
There are numerous examples of sedimentary serpentinite deposits exposed on land that are very similar to the deposits recovered from the serpentine seamounts drilled on ODP Leg 125. We suggest that Conical Seamount may be a type locality for the study of in situ formation of many of these sedimentary serpentinite bodies. Further, we suggest that both the deposits drilled on Conical Seamount and on Torishima Forearc Seamount demonstrate that serpentinization can continue in situ within the seamounts through interaction of the serpentine deposits with both seawater and subduction-related fluids.
Project(s):
Coverage:
Median Latitude: 22.381437 * Median Longitude: 145.437938 * South-bound Latitude: 19.499000 * West-bound Longitude: 141.738000 * North-bound Latitude: 30.964300 * East-bound Longitude: 146.696000
Date/Time Start: 1986-03-26T10:30:00 * Date/Time End: 1989-03-31T10:00:00
Minimum Elevation: -4912.0 m * Maximum Elevation: -3095.0 m
Event(s):
125-778A  * Latitude: 19.499000 * Longitude: 146.666000 * Date/Time Start: 1989-02-22T06:30:00 * Date/Time End: 1989-02-24T19:25:00 * Elevation: -3924.0 m * Penetration: 107.6 m * Recovery: 22.8 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 13 cores; 107.6 m cored; 0 m drilled; 21.2 % recovery
125-779A  * Latitude: 19.512500 * Longitude: 146.696000 * Date/Time Start: 1989-02-28T10:00:00 * Date/Time End: 1989-03-04T03:00:00 * Elevation: -3958.0 m * Penetration: 317.2 m * Recovery: 73.24 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 37 cores; 317.2 m cored; 0 m drilled; 23.1 % recovery
125-780A  * Latitude: 19.541800 * Longitude: 146.655000 * Date/Time Start: 1989-03-04T08:45:00 * Date/Time End: 1989-03-05T04:30:00 * Elevation: -3098.0 m * Penetration: 3.5 m * Recovery: 3.54 m * Location: North Pacific Ocean * Campaign: Leg125 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 1 core; 3.5 m cored; 0 m drilled; 101.1 % recovery
Comment:
X = definitely present, x = probably present, ?x = possible present, ? = questionable, - = absent. Analysed on bulk samples.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
Event labelEvent
Sample code/labelSample labelFryer, Patricia BDSDP/ODP/IODP sample designation
ChrysotileCtlFryer, Patricia B
LizarditeLzFryer, Patricia B
AntigoriteAtgFryer, Patricia B
GreenaliteGreFryer, Patricia B
TalcTlcFryer, Patricia B
ChloriteChlFryer, Patricia B
BruciteBrcFryer, Patricia B
10 Profundobythere volansP. volansFryer, Patricia B
11 IowaiteIowaiteFryer, Patricia B
12 BrugnatelliteBrugnatelliteFryer, Patricia B
13 CoalingiteCoalingiteFryer, Patricia B
14 Sjogrenite groupSjogrenite grFryer, Patricia Bothers
15 CalciteCalFryer, Patricia B
16 AragoniteArgFryer, Patricia B
17 SideriteSdFryer, Patricia B
18 OlivineOlFryer, Patricia B
19 OrthopyroxeneOpxFryer, Patricia B
20 SpinelSplFryer, Patricia B
21 GarnetGrtFryer, Patricia B
22 EpidoteEpFryer, Patricia B
23 AmphiboleAmpFryer, Patricia B
24 GoethiteGthFryer, Patricia B
25 LoughliniteLoughliniteFryer, Patricia B
26 ChaoiteChaoiteFryer, Patricia B
27 MagnetiteMagFryer, Patricia B
28 ChromiteChrFryer, Patricia B
29 Opaque mineralsOpaqueFryer, Patricia Bothers
Size:
1092 data points

Data

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


Event

Sample label

Ctl

Lz

Atg

Gre

Tlc

Chl

Brc
10 
P. volans
11 
Iowaite
12 
Brugnatellite
13 
Coalingite
14 
Sjogrenite gr
15 
Cal
16 
Arg
17 
Sd
18 
Ol
19 
Opx
20 
Spl
21 
Grt
22 
Ep
23 
Amp
24 
Gth
25 
Loughlinite
26 
Chaoite
27 
Mag
28 
Chr
29 
Opaque
125-778A 125-778A-1R-1,145-150Xx---X-XX-x-------------?xx-
125-778A125-778A-1R-4,145-150X------X---X---------------
125-778A125-778A-7R-1,140-150X------X-Xx-------X-----X--
125-778A125-778A-11R-1,140-150X-----xX-----------x----X--
125-778A125-778A-12R-1,140-150X-?x------X?x---------------X
125-778A125-778A-13R-1,140-150X---X--X--------?x-X--------
125-779A 125-779A-2R-2,145-150X----X-Xx----X-------x-----
125-779A125-779A-5R-3,46-56X----X-X--X----------XX----
125-779A125-779A-13R-1,140-150Xx?x---XX--x--------------x-
125-779A125-779A-18R-2,7-17Xx?x--X-X--x--------------?x-
125-779A125-779A-28R-2,95-105X?x---XXX-----------------?x-
125-779A125-779A-30R-1,140-150x----x-X-------------------
125-779A125-779A-32R-2,0-10X------x----------------X--
125-779A125-779A-34R-1,111-121Xx-----X--x----------------
125-779A125-779A-36R-2,135-150x--X-XXX--------X-X-X---xx-
125-779A125-779A-37R-1,135-150Xx---XX---------X-------x--
125-780A 125-780A-1H-1,45-55X-----XXX----x----?xX----?x--
125-780A125-780A-1H-1,95-105X-----XX-X-X---------------
125-780A125-780A-1H-1,145-150X----------X---------------
125-780A125-780A-1H-2,57-67X------X---X-X-------------
125-780A125-780A-1H-2,57-67X------XX--X-X-------------
125-780B 125-780B-1R-6,106-116X-----XXX--X-XX------------
125-780C 125-780C-1R-3,140-150XX-----XX----?xX----X----x--
125-780C125-780C-5R-1,48-58X-----X-X--------?x------?x--
125-780C125-780C-15R-1,38-48X-----X-X---X----x-----?x?x--
125-780D 125-780D-1X-2,96-106X------XX---x-x----x---Xx--
125-780D125-780D-1X-3,68-78X------XX---?x-?x------------
125-780D125-780D-2X-1,40-50X------xX---X-X---xx----x--
125-780D125-780D-6X-1,68-78X-----XXX--------------Xx--
125-780D125-780D-7X-5,135-150X-----XXX----------X---x---
125-783A 125-783A-15R-2,140-150X--------------------x?x---?x
125-783A125-783A-16R-2,135-150Xx----x------?x----X------X?x
125-783A125-783A-17R-1,140-150Xx--------------?x-x------?x?x
125-784A 125-784A-35R-1,135-150Xx---XXX-----X---x------?x?xX
125-784A125-784A-39R-2,0-15X------X-x-------x---------
125-784A125-784A-40R-1,135-150X------X----------------xx-
125-784A125-784A-41R-1,92-107Xx-----X---x---------------
125-784A125-784A-42R-1,135-150X------X--XX---------------
125-784A125-784A-43R-2,135-150Xx-----X-----?-------------