Zhou, Weiming; Van der Voo, Rob; Peacor, Donald R (1999): Comparisons of z values between fine-grained titanomagnetites within interstitial glass and large-grained titanomaghemtes in older ocean-floor basalts [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712082
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Abstract:
Transmission electron microscopy observations and rock magnetic measurements reveal that alteration of fine- and large-grained iron-titanium oxides can occur at different rates. Fine-grained titanomagnetite occurs as a crystallization product within interstitial glass that originated as an immiscible liquid within a fully differentiated melt; in several samples with ages to 32 Ma it displays very little or no oxidation (z = ca. 0). In contrast, samples with ages of 10 Ma or older are observed to also contain highly oxidized (z >/= 0.66) large-grained titanomaghemite. These large grains, having originated by direct crystallization from melt, are associated with pore space. Such pore space can serve as a conduit for fluids that promote alteration, whereas fine grains may have been "armored" against alteration by the glass matrix in which they are embedded. Apparently, alteration of oceanic crust is a heterogeneous process on a microscopic scale. The existence of pristine, fine-grained titanomagnetite in the interstitial glass of older ocean-floor basalts that have undergone significant alteration implies that such glassy material is capable of carrying original thermal remanent magnetization and may be suitable for paleointensity determinations.
Related to:
Zhou, Weiming; Van der Voo, Rob; Peacor, Donald R (1999): Preservation of pristine titanomagnetite in older ocean-floor basalts and its significance for paleointensity studies. Geology, 27(11), 1043-1046, https://doi.org/10.1130/0091-7613(1999)027%3C1043:POPTIO%3E2.3.CO;2
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 17.143153 * Median Longitude: -35.895257 * South-bound Latitude: -26.136700 * West-bound Longitude: -83.530000 * North-bound Latitude: 38.939700 * East-bound Longitude: -11.666200
Date/Time Start: 1974-01-21T00:00:00 * Date/Time End: 1981-09-22T00:00:00
Event(s):
34-320B * Latitude: -9.006700 * Longitude: -83.530000 * Date/Time: 1974-01-21T00:00:00 * Elevation: -4483.0 m * Penetration: 183 m * Recovery: 18.1 m * Location: South Pacific/BASIN * Campaign: Leg34 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 47 m cored; 0 m drilled; 38.5 % recovery
37-335 * Latitude: 37.295700 * Longitude: -35.198700 * Date/Time: 1974-07-18T00:00:00 * Elevation: -3188.0 m * Penetration: 562 m * Recovery: 59 m * Location: North Atlantic * Campaign: Leg37 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 16 cores; 152 m cored; 0 m drilled; 38.8 % recovery
73-519A * Latitude: -26.136700 * Longitude: -11.666200 * Date/Time: 1980-04-22T00:00:00 * Elevation: -3769.0 m * Penetration: 180 m * Recovery: 61.4 m * Location: South Atlantic/RIDGE * Campaign: Leg73 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 9 cores; 84.5 m cored; 0 m drilled; 72.7 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2 datasets
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Datasets listed in this publication series
- Zhou, W; Van der Voo, R; Peacor, DR (1999): (Table 1) Comparisons of z values between fine-grained titanomagnetites within interstitial glass and large-grained titanomaghemtes in older ocean-floor basalts from DSDP Hole 82-556. https://doi.org/10.1594/PANGAEA.712081
- Zhou, W; Van der Voo, R; Peacor, DR (1999): (Table 1) Comparisons of z values between fine-grained titanomagnetites within interstitial glass and large-grained titanomaghemtes in older ocean-floor basalts from DSDP Holes 34-520B, 37-335, and 73-519A. https://doi.org/10.1594/PANGAEA.712080