Citation:

epic.28295.d001

Name: Occurence of marine palynomorphs of sediment core CRP-1 (Table 1)
Published: 1998
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

The first core of the Cape Roberts Project, CRP-1, penetrated a Quaternary and lower Miocene section rather than the anticipated Palaeogene sediments. Initial palynologic study was conducted at the Crary Science and Engineering Laboratory, McMurdo Station, concurrent with drilling. Rapid and environmentally safe sample processing was made possible by the use of a focused microwave digestion unit that scrubbed acid fumes. In situ and/or reworked dinocysts (dinoflagellate cysts), acritarchs (leiospheres and acanthomorphs), and prasinophyte phycomata are present in the 35 samples studied. Overall, the CRP-1 assemblages are similar to Arctic marine palynomorph assemblages that are used there as ice margin indicators. Some of the acanthomorph acritarchs recovered from the CRP-1 core closely resemble cysts of extant Antarctic autotrophic sea-ice dinoflagellates. It is possible that some of these acanthomorphs are actually dinocysts, and could be used as indicators of sea-ice conditions similar to today.

Most of the in situ marine palynomorphs are undescribed taxa and thus are presently of little biostratigraphic value. Dating of the core was based on diatom, palaeomagnetic and strontium isotope studies. The upper 43.55 mbsf of the core are Quaternary in age and the rest of the core, down to the bottom at 147.69 mbsf, is of early Miocene age. Although not biostratigraphically significant, the dinocysts are the first in situ Quaternary and Miocene dinocysts reported from East Antarctica, and constitute the most diverse assemblage recovered from any firmly dated Neogene section from Antarctica. In addition, they confirm that cyst-producing dinoflagellates were present in Antarctic waters during the Neogene and Quaternary.

The core can be divided into three intervals based on their palynomorph assemblages (Quaternary, 0-43.55 mbsf; lower Miocene, 43.55-99.10 mbsf; and lower Miocene, 99.10- 147.69 mbsf). The distinctive palynomorph assemblages are interpreted to reflect changing climatic conditions that prevailed at the time of deposition. Overall, conditions appear to have deteriorated up-section.

Project(s):

Cape Roberts Project (CRP)

Coverage:

Latitude: -77.007580 * Longitude: 163.755080

Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00

Minimum DEPTH, sediment/rock: 4.25 m * Maximum DEPTH, sediment/rock: 144.31 m

Event(s):

CRP-1 (16 km ENE Cape Roberts) * Latitude: -77.007580 * Longitude: 163.755080 * Date/Time Start: 1997-10-17T01:30:00 * Date/Time End: 1997-10-24T02:00:00 * Elevation: -153.5 m * Penetration: 132.06 m * Recovery: 113.32 m * Location: off Cape Roberts, Ross Sea, Antarctica * Campaign: * Basis: Sampling/drilling ice * Method/Device: Core wireline system (CWS) * Comment: sea ice thickness: 1.60 m, recovery 86 %. Age and lithology of oldest strata: 22-24 Ma; mudstone with scattered pebbles.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Depth, top/min	Depth top	m	Wrenn, John
3	Depth, bottom/max	Depth bot	m	Wrenn, John
4	Leiosphaeridia sp.	Leiosphaeridia sp.	#	Wrenn, John	Counting, palynology	species 2
5	Leiosphaeridia sp.	Leiosphaeridia sp.	#	Wrenn, John	Counting, palynology	species 1
6	Leiosphaeridia sp.	Leiosphaeridia sp.	#	Wrenn, John	Counting, palynology	species 3
7	Lycopodium spike	Lycopodium spike	#	Wrenn, John	Counting, palynology
8	Tasmanites	Tasmanites	#	Wrenn, John	Counting, palynology	small
9	Cymatiosphaera sp.	Cymatiosphaera sp.	#	Wrenn, John	Counting, palynology	species 1
10	Cymatiosphaera sp.	Cymatiosphaera sp.	#	Wrenn, John	Counting, palynology	species 2
11	Cymatiosphaera sp.	Cymatiosphaera sp.	#	Wrenn, John	Counting, palynology	species 3
12	Cymatiosphaera sp.	Cymatiosphaera sp.	#	Wrenn, John	Counting, palynology	species 6
13	Vozzhennikovia apertura	V. apertura	#	Wrenn, John	Counting, palynology
14	Impagidinium sp.	Impagidinium sp.	#	Wrenn, John	Counting, palynology
15	Indeterminata/varia	Indet	#	Wrenn, John	Counting, palynology
16	Sigmopollis sp.	Sigmopollis sp.	#	Wrenn, John	Counting, palynology
17	Batiacasphaera cooperi	B. cooperi	#	Wrenn, John	Counting, palynology
18	Paralecaniella indentata	P. indentata	#	Wrenn, John	Counting, palynology
19	Psilate sphere	Psilate sphere	#	Wrenn, John	Counting, palynology
20	Foraminifera, linings	Foram lin	#	Wrenn, John	Counting, palynology
21	Spinidinium macmurdoense	Spinidinium macmurdo	#	Wrenn, John	Counting, palynology
22	Operculodinium sp.	Operculodinium sp.	#	Wrenn, John	Counting, palynology
23	Micrhystridium sp.	Micrhystridium sp.	#	Wrenn, John	Counting, palynology	species 2
24	Micrhystridium sp.	Micrhystridium sp.	#	Wrenn, John	Counting, palynology	species 5
25	Micrhystridium sp.	Micrhystridium sp.	#	Wrenn, John	Counting, palynology	species 6
26	Micrhystridium sp.	Micrhystridium sp.	#	Wrenn, John	Counting, palynology	species 1
27	Micrhystridium sp.	Micrhystridium sp.	#	Wrenn, John	Counting, palynology	species 3
28	Micrhystridium sp.	Micrhystridium sp.	#	Wrenn, John	Counting, palynology	species 4
29	Micrhystridium sp.	Micrhystridium sp.	#	Wrenn, John	Counting, palynology	species 7
30	Arthropod and annelid parts	Arthropod+annelid	#	Wrenn, John	Counting, palynology
31	Spiniferites sp.	Spiniferites sp.	#	Wrenn, John	Counting, palynology
32	Spiniferites sp.	Spiniferites sp.	#	Wrenn, John	Counting, palynology	species 1
33	Lejeunecysta cowiei	Lejeunecysta cowiei	#	Wrenn, John	Counting, palynology
34	Brigantedinium pynei	B. pynei	#	Wrenn, John	Counting, palynology
35	Lejeunecysta fallax	Lejeunecysta fallax	#	Wrenn, John	Counting, palynology
36	Alterbidinium cf. asymmetrica	A. cf. asymmetrica	#	Wrenn, John	Counting, palynology
37	Deflandrea antarctica	D. antarctica	#	Wrenn, John	Counting, palynology
38	Pterospermella sp.	Pterospermella sp.	#	Wrenn, John	Counting, palynology
39	Operculodinium bergmannii	Operculodinium bergm	#	Wrenn, John	Counting, palynology
40	Vozzhennikovia cf. apertura	v. cf. apertura	#	Wrenn, John	Counting, palynology
41	Phelodinium cranwelliae	Phelodinium cranwell	#	Wrenn, John	Counting, palynology
42	Dinoflagellates, total	Dinofl total	#	Wrenn, John	Counting, palynology	Dinofl 1
43	Dinoflagellates, total	Dinofl total	#	Wrenn, John	Counting, palynology	Dinofl 2
44	Acritarcha	Acr	#	Wrenn, John	Counting, palynology

License:

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

Size:

1505 data points

Data

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

1 Depth sed [m]	2 Depth top [m]	3 Depth bot [m]	4 Leiosphaeridia sp. [#] (species 2)	5 Leiosphaeridia sp. [#] (species 1)	6 Leiosphaeridia sp. [#] (species 3)	7 Lycopodium spike [#]	8 Tasmanites [#] (small)	9 Cymatiosphaera sp. [#] (species 1)	10 Cymatiosphaera sp. [#] (species 2)	11 Cymatiosphaera sp. [#] (species 3)	12 Cymatiosphaera sp. [#] (species 6)	13 V. apertura [#]	14 Impagidinium sp. [#]	15 Indet [#]	16 Sigmopollis sp. [#]	17 B. cooperi [#]	18 P. indentata [#]	19 Psilate sphere [#]	20 Foram lin [#]	21 Spinidinium macmurdo [#]	22 Operculodinium sp. [#]	23 Micrhystridium sp. [#] (species 2)	24 Micrhystridium sp. [#] (species 5)	25 Micrhystridium sp. [#] (species 6)	26 Micrhystridium sp. [#] (species 1)	27 Micrhystridium sp. [#] (species 3)	28 Micrhystridium sp. [#] (species 4)	29 Micrhystridium sp. [#] (species 7)	30 Arthropod+annelid [#]	31 Spiniferites sp. [#]	32 Spiniferites sp. [#] (species 1)	33 Lejeunecysta cowiei [#]	34 B. pynei [#]	35 Lejeunecysta fallax [#]	36 A. cf. asymmetrica [#]	37 D. antarctica [#]	38 Pterospermella sp. [#]	39 Operculodinium bergm [#]	40 v. cf. apertura [#]	41 Phelodinium cranwell [#]	42 Dinofl total [#] (Dinofl 1)	43 Dinofl total [#] (Dinofl 2)	44 Acr [#]
4.25	0.00	8.50	89	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	1
20.04	20.04	20.04	5	14	4	0	1	8	4	0	0	1	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	135
20.60	20.60	20.61	8	0	0	3753	0	1	1	0	0	0	2	4	9	1	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
25.10	25.10	25.10	0	0	2	3518	0	0	0	0	0	0	0	0	0	0	1	8	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
31.55	31.50	31.60	3	0	0	3911	0	0	0	0	0	0	0	20	3	0	0	0	18	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
34.00	34.00	34.00	5	0	25	2146	0	0	0	0	0	0	0	0	13	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
36.60	36.60	36.60	20	2	50	2362	0	0	1	0	0	0	0	0	17	0	0	4	12	0	5	1	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	2
39.06	39.06	39.07	29	27	0	4157	0	2	0	0	0	0	0	44	89	0	0	0	14	0	0	1	2	0	0	0	0	0	0	1	0	2	1	2	0	0	0	0	0	0	0	0	4
42.40	42.40	42.40	15	6	9	2751	0	3	0	0	0	0	0	0	10	0	0	2	4	0	1	0	0	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	80
48.36	48.35	48.36	1	0	0	885	0	0	0	1	0	0	0	26	5	0	1	0	34	0	0	0	0	0	190	8	42	0	1	2	0	0	2	47	0	0	0	0	0	0	0	0	260
48.40	48.40	48.40	0	0	5	1186	0	0	0	3	0	1	0	0	2	0	5	27	52	0	0	0	0	0	47	13	31	0	0	0	0	0	0	44	0	0	0	0	0	0	0	0	130
53.50	53.50	53.50	0	4	0	14	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	3
54.46	54.45	54.46	26	0	0	865	0	0	0	0	0	0	0	7	49	0	0	0	9	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	26
54.87	74.87	74.87	13	1	7	317	0	0	0	2	0	1	0	0	5	0	0	4	7	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	12
58.43	58.43	58.43	4	0	17	1448	0	0	0	0	0	6	0	0	21	0	5	9	116	0	0	1	0	0	12	0	8	0	1	3	1	0	0	6	1	5	4	0	0	0	0	0	85
62.90	62.90	62.90	0	0	1	930	0	0	0	0	0	0	0	0	0	0	0	3	17	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	1	0	0	0	0	0	6
67.54	67.54	67.55	24	5	0	961	0	0	0	4	0	0	3	16	47	0	0	0	26	0	0	0	3	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	0	0	0	74
70.02	70.02	70.02	79	1	30	1	0	0	0	0	0	1	1	0	22	0	0	4	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	2	0	0	0	0	1
78.20	78.15	78.25	0	1	0	169	0	0	0	1	0	0	0	19	17	0	0	0	5	0	0	3	0	0	11	6	11	0	0	0	0	7	8	2	0	0	0	0	0	0	0	0	1
78.75	78.75	78.75	96	4	73	3707	0	1	1	5	0	0	0	0	26	0	2	26	26	0	0	0	0	0	0	0	12	1	16	0	0	0	0	11	0	0	1	0	1	0	0	0	21
82.18	82.18	82.19	94	0	0	2370	0	0	0	0	0	0	1	27	307	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	5	0	0	0	0	0	0	0	0	0	0	20
85.36	85.36	85.36	15	0	10	931	0	4	0	14	0	0	0	0	8	1	1	17	19	0	0	1	0	0	1	3	49	1	2	0	0	0	0	53	0	0	1	0	0	2	0	0	311
87.42	87.42	87.43	29	0	0	1914	0	1	0	16	0	0	2	11	43	0	0	0	22	0	0	0	0	0	57	2	67	0	5	0	0	22	5	2	0	0	0	0	0	0	0	0	12
92.34	92.34	92.34	25	1	17	1919	0	1	1	5	0	0	0	0	15	1	0	18	7	0	0	0	0	0	0	0	0	0	1	0	0	0	3	5	0	0	3	0	0	0	0	0	0
96.38	96.37	96.38	55	0	0	3144	0	23	54	60	0	0	0	31	103	0	0	0	25	0	0	0	0	0	6	21	0	0	7	0	0	27	16	0	0	0	0	0	0	0	0	0	260
99.10	99.10	99.10	42	3	19	1570	0	2	0	18	22	0	0	0	30	0	2	19	35	0	0	63	0	0	3	15	29	0	2	0	0	4	4	9	0	0	5	0	0	4	16	1	29
104.75	104.75	104.75	18	0	6	1338	0	0	0	0	0	0	0	0	29	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	2
108.78	108.75	108.80	78	0	0	3300	0	0	2	0	0	1	0	9	167	0	0	0	1	0	0	0	0	0	0	0	0	0	0	0	0	0	7	0	0	0	0	0	0	0	0	0	97
112.44	112.44	112.44	59	2	32	1254	0	0	0	1	0	0	0	0	43	2	8	20	116	0	0	0	0	0	0	0	0	0	2	1	0	0	2	0	0	0	1	0	0	1	0	0	25
116.46	116.46	116.47	0	0	0	2700	0	1	380	0	0	10	0	6	381	0	0	0	3	0	0	0	0	0	0	0	0	0	0	1	0	1	1	0	0	0	0	0	0	2	0	0	0
120.27	120.27	120.27	191	0	28	1658	0	0	0	1	0	2	0	0	102	0	5	5	9	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	2	0	0	0
120.45	120.40	120.50	79	13	0	1565	0	0	0	0	0	0	1	11	169	0	0	0	4	0	0	0	0	0	0	0	0	0	0	0	0	8	10	0	0	0	0	0	0	0	0	0	0
128.12	128.12	128.12	135	0	38	1719	0	0	0	2	0	0	0	0	77	0	2	7	9	0	0	0	0	0	0	0	0	0	2	0	0	0	0	0	0	0	0	0	0	5	0	0	45
136.20	136.20	136.20	102	0	44	1849	0	0	0	2	0	0	0	0	87	0	1	5	20	0	0	0	0	0	0	0	0	0	0	0	0	1	0	0	0	0	0	0	0	1	0	0	51
144.31	144.31	144.31	122	1	54	807	0	0	0	2	0	0	0	0	120	2	1	18	18	0	0	0	0	0	0	0	0	0	0	0	0	0	3	2	0	0	0	0	0	11	0	0	3