Citation:

odp.proc.sr.135.118.1994

Name: (Table 1) Distribution of larger benthic and planktonic foraminifers in ODP Hole 135-841B
Creator: George C H Chaproniere
Published: 1994
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Larger foraminifers were recovered from three levels within Hole 841B, located on the Tongan Platform. The lowest faunas are from Eocene beds (Unit V) in fault contact with an older rhyolitic volcanic sequence. These Eocene faunas are typified by two assemblages: one with Amphistegina waiareka, Astewcyclina matanzensis, Discocyclina omphala, Operculina pacifica, together with rare Heterostegina saipanensis and Sherbornina carteri; the second assemblage contains these species and, in addition, Spiroclypeus vermicularis. The lowest assemblage is associated with a middle Eocene planktonic foraminifer fauna (Acarinina, Morozovella), and the upper faunas with a late Eocene assemblage. This Eocene unit is disconformably overlain by a middle Miocene sequence (Unit IV) containing assemblages dominated by planktonic foraminifers. Two samples were found to contain shallow-water benthic foraminifers: one contained Amphistegina radiata, Cycloclypeus sp., Lepidocyclina (Nephrolepidina) ?howchini, and Sphaerogypsina globula; a second sample from this section contained only Amphistegina radiata. The third level at which larger foraminifers were found was in the lower part of the late Miocene section (Unit III), where late Eocene larger foraminifers (Asterocyclina matanzensis, Discocyclina omphala, Nummulites pengaronensis, and Pellatispira madaraszi) are present in a conglomeratic sequence with late Miocene planktonic foraminifers present in the matrix.

The two larger foraminifer assemblages of Unit V are typical of the Ta3 and Tb Letter Stages, which are distinguished by the presence of Spiroclypeus vermicularis. The Ta3 Letter Stage assemblage is associated with a Zone P14 planktonic fauna, and the Tb Letter Stage assemblage with Zones PI5 to PI6 fauna.

The larger foraminifers associated with middle and late Eocene planktonic foraminifers are almost certainly in situ, and indicate water depths from between 50 and 100 m in the middle Eocene, shallowing to <50 m, and then gradually deepening to >100 m by the end of the Eocene. The middle Miocene faunas have been derived from shallow-water environments adjacent to the sites of deposition (which would have been in excess of 100 m), and may have been contemporaneous or reworked from rocks no older than the Ta5 Letter Stage. Late Eocene larger foraminifers (Tb Letter Stage) were reworked into the deep-water, late Miocene environments as products of erosion from adjacent exposures of Eocene carbonates.

A hiatus is probably present in the lower part of the Eocene section, separating the middle and late Eocene (Ta3 and Tb Letter Stages-Zones P14 and P15). This is probably the result of eustatic changes. Unit V almost certainly contains the Eocene/Oligocene boundary, based on the planktonic foraminifer evidence, but larger foraminifers disappear some distance below this boundary, within Zones P15 or P16. The larger foraminifer faunas from Units III and V provide evidence that water depths at this part of the Tongan Platform have increased from approximately 50 m during the late middle Eocene to below the calcium carbonate compensation depth by the late Miocene, respectively.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: -23.346000 * Longitude: -175.297000

Date/Time Start: 1991-02-02T15:40:00 * Date/Time End: 1991-02-10T20:30:00

Minimum DEPTH, sediment/rock: 345.09 m * Maximum DEPTH, sediment/rock: 605.02 m

Event(s):

135-841B * Latitude: -23.346000 * Longitude: -175.297000 * Date/Time Start: 1991-02-02T15:40:00 * Date/Time End: 1991-02-10T20:30:00 * Elevation: -4821.0 m * Penetration: 834.2 m * Recovery: 182.54 m * Location: South Pacific Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 70 cores; 664.4 m cored; 0 m drilled; 27.5 % recovery

Comment:

X = present, ? = questionable occurrence, - = absent.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Chaproniere, George C H	DSDP/ODP/IODP sample designation
2	DEPTH, sediment/rock	Depth sed	m			Geocode
3	Globigerinatheka sp.	Globigerinatheka sp.		Chaproniere, George C H
4	Globigerinoides extremus	G. extremus		Chaproniere, George C H
5	Globigerinoides ruber	G. ruber		Chaproniere, George C H
6	Globoquadrina dehiscens	G. dehiscens		Chaproniere, George C H
7	Globorotalia sp.	Globorotalia sp.		Chaproniere, George C H
8	Globorotalia tumida plesiotumida	G. tumida plesiotumida		Chaproniere, George C H		questionable
9	Foraminifera, planktic indeterminata	Foram plankt indet		Chaproniere, George C H
10	Morozovella sp.	Morozovella sp.		Chaproniere, George C H
11	Orbulina universa	O. universa		Chaproniere, George C H
12	Pulleniatina sp.	Pulleniatina sp.		Chaproniere, George C H
13	Sphaeroidinellopsis spp.	Sphaeroidinellopsis spp.		Chaproniere, George C H
14	Subbotina eocaena	S. eocaena		Chaproniere, George C H
15	Amphistegina radiata	A. radiata		Chaproniere, George C H
16	Amphistegina awiareka	A. awiareka		Chaproniere, George C H
17	Asterigerina tentoria	A. tentoria		Chaproniere, George C H
18	Asterocyclina matanzensis	A. matanzensis		Chaproniere, George C H
19	Biarritzina sp.	Biarritzina sp.		Chaproniere, George C H
20	Cibicides sp.	Cibicides sp.		Chaproniere, George C H
21	Cycloclypeus sp.	Cycloclypeus sp.		Chaproniere, George C H
22	Discocyclina omphala	D. omphala		Chaproniere, George C H
23	Discogypsina discus	D. discus		Chaproniere, George C H
24	Halkyardia minima	H. minima		Chaproniere, George C H		genus questionable
25	Heterostegina saipanensis	H. saipanensis		Chaproniere, George C H
26	Foraminifera, benthic porcelaneous indeterminata	Foram benth porc ind		Chaproniere, George C H
27	Foraminifera, benthic rotalidia indeterminata	Foram benth rotalidia indet		Chaproniere, George C H
28	Foraminifera, benthic agglutinated indeterminata	Foram benth agg ind		Chaproniere, George C H
29	Lenticulina sp.	Lenticulina sp.		Chaproniere, George C H
30	Lepidocyclina howchini	L. howchini		Chaproniere, George C H		L. (Nephrolepidina) ?howchini
31	Nonionella sp.	Nonionella sp.		Chaproniere, George C H
32	Nummulites pengaronensis	N. pengaronensis		Chaproniere, George C H
33	Operculina pacifica	O. pacifica		Chaproniere, George C H
34	Pellatispira madaraszi	P. madaraszi		Chaproniere, George C H
35	Sherbornina carteri	S. carteri		Chaproniere, George C H
36	Sphaerogypsina globulus	S. globulus		Chaproniere, George C H
37	Spiroclypeus vermicularis	S. vermicularis		Chaproniere, George C H
38	Bryozoa	Bryozoa		Chaproniere, George C H
39	Algae abundance	Algae abund		Chaproniere, George C H		coralline, articulated
40	Algae abundance	Algae abund		Chaproniere, George C H		coralline, nodular
41	Echinoidea	Echinoidea		Chaproniere, George C H
42	Halimeda	Halimeda		Chaproniere, George C H
43	Mollusca	Mollusca		Chaproniere, George C H
44	Ostracoda	Ostrac		Chaproniere, George C H

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

860 data points

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