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Westphal, Hildegard; Heindel, Katrin; Brandano, M; Peckmann, Jörn Ludwig (2012): (Table 1) Different age analysis from IODP Site 310-M0018A. PANGAEA,, Supplement to: Westphal, H et al. (2010): Genesis of microbialites as contemporaneous framework components of deglacial coral reefs, Tahiti (IODP 310). Facies, 56(3), 337-352,

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Deglacial reefs from Tahiti (IODP 310) feature a co-occurrence of zooxanthellate corals with microbialites that compose up to 80 vol% of the reef framework. The notion that microbialites tend to form in more nutrient-rich environments has previously led to the concept that such encrustations are considerably younger than the coral framework, and that they have formed in deeper storeys of the reef edifice, or that they represent severe disturbances of the reef ecosystem. As indicated by their repetitive interbedding with coralline red algae, the microbialites of this reef succession of Tahiti, however, formed immediately after coral growth under photic conditions. Clearly, the deglacial reef microbialites present in the IODP 310 cores did not follow disturbances such as drowning or suffocation by terrestrial material, and are not "disaster forms". Given that the corals and the microbialites developed in close spatial proximity, highly elevated nutrient levels caused by fluvial or groundwater transport from the volcanic hinterland are an unlikely cause for the exceptionally voluminous development of microbialites. That voluminous deglacial reef microbialites generally are restricted to volcanic islands, however, implies that moderately, and possibly episodically elevated nutrient levels favored this type of microbialite formation.
Latitude: -17.767350 * Longitude: -149.548260
Date/Time Start: 2005-11-03T18:36:00 * Date/Time End: 2005-11-04T11:23:00
Minimum Elevation: -81.8 m * Maximum Elevation: -81.8 m
310-M0018A (TAH-03A-1E) * Latitude: -17.767350 * Longitude: -149.548260 * Date/Time Start: 2005-11-03T18:36:00 * Date/Time End: 2005-11-04T11:23:00 * Elevation: -81.8 m * Penetration: 40.05 m * Recovery: 24.63 m * Location: Tahiti, offshore Maraa * Campaign: Exp310 (Tahiti Sea Level) * Basis: DP Hunter * Device: Drilling/drill rig (DRILL) * Comment: Coordinate system: WGS84, Time zone: UTC -10
Geocode = Age is given in calendar years BP and intercept points of the calibrated age ranges (1a) with the calibration dataset marine04.14c.
(a) = Radiocarbon ages were calibrated using calib rev 5.0.1 (Stuiver and Reimer 1993) and the marine04.14c dataset (Hughen et al. 2004) with a further adjustment of a regional reservoir age Delta R = 82 ± 42 (Delta R = deviation from the average global reservoir age of ca 400 years). The extremes of 1sigma cal. age ranges are given.
#NameShort NameUnitPrincipal InvestigatorMethodComment
1CommentCommentWestphal, HildegardODP sample designation
2Sample code/labelSample labelWestphal, Hildegard
3Depth, reconstructedReconstr depthmWestphal, HildegardDepth water (mbsl)
4PositionPositionWestphal, HildegardPosition in microbialite crust
5Age, datedAge datedkaWestphal, HildegardAge, 14C AMS(a)
6Age, dated standard deviationAge dated std dev±Westphal, HildegardAge, 14C AMS(a)
7Age, minimum/youngAge minkaWestphal, Hildegardcalibrated1 sigma
8Age, maximum/oldAge maxkaWestphal, Hildegardcalibrated1 sigma
9AGEAgeka BPGeocode
13 data points

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