Stratigraphical and Chronological Correlations Between Monte Vulture Volcanics and Sedimentary Deposits of the Venosa Basin

Bonadonna, Francescopaolo; Brocchini, Debora; Laurenzi, M. A.; Principe, Claudia; Ferrara, G.

doi:10.1016/s1040-6182(97)00074-8

Cited by 17 publications

(23 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The samples we dated have no exposed stratigraphic relation to the other synthems. One dyke (sample VUT 110; Table A1) was analyzed three times: an acid-leached K-feldspar separate (Villa unpublished data 1988, re-evaluated here), and unleached separates in Bonadonna et al (1998) and in the present work.…”

Section: Spinoritola Subsynthemmentioning

confidence: 97%

“…During the past three decades several authors have presented geochronological data: K-Ar analyses (Cortini 1975) and 39 Ar-40 Ar analyses (Villa 1985(Villa , 1988(Villa , 1991Brocchini et al 1994;Bonadonna et al 1998). The 39 Ar-40 Ar studies broadly constrain the main volcanic activity of Monte Vulture, but show significant discrepancies.…”

Section: Introductionmentioning

confidence: 99%

“…Data presented in Brocchini et al (1994) and Bonadonna et al (1998) were calculated using an assumed age of 27.55 Ma for the Fish Canyon (FC) irradiation monitor; the Renne et al (1998) calibration of FC, 28.02 Ma, results in an increase of ages by ca. 2%.…”

Section: Introductionmentioning

confidence: 99%

“…2%. Furthermore, ages published by Bonadonna et al (1998) were expressed as isochron calculations. It should be noted that isochrons (correlation of 36 Ar/ 40 Ar and 39 Ar/ 40 Ar) mostly do not consider the possible presence of non-cogenetic phases in a mineral separate (Villa 1992).…”

Section: Introductionmentioning

confidence: 99%

“…An alignment of data points alone does not guarantee that a single, monogenetic phase was analyzed (Villa 2001), and chemical correlation diagrams are required (see below). Here we recalculated nine ages of Brocchini et al (1994) and Bonadonna et al (1998) on the basis of the raw data in Brocchini (1993) and of the petrological-chemical criteria outlined below.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Chronostratigraphy of Monte Vulture volcano (southern Italy): secondary mineral microtextures and 39Ar-40Ar systematics

Villa

Buettner

2009

Bull Volcanol

View full text Add to dashboard Cite

The eruptive history of Monte Vulture has been the subject of several geochronological investigations during the past decades, which reliably dated only a small number of eruptions. Understanding the causes of suboptimum data yield in the past requires an interdisciplinary approach. We re-analyzed samples from previous works and present new data on samples from the main volcanostratigraphic units of Monte Vulture, so as to provide an improved, consistent chronostratigraphic database. Imaging of minerals by cathodoluminescence and backscattered electrons reveals that heterochemical, high-temperature deuteric reaction textures are ubiquitous. Such observations are common in metamorphic rocks but had not frequently been reported from volcanic rocks. In view of the mineralogical complexity, we base our chronological interpretation on isochemical steps, defined as steps for which the Cl/K and/or the Ca/K ratios are constant. Isochemical steps carry the isotopic signature of chemically homogeneous mineral phases and therefore allow a wellconstrained age interpretation. Comparison of old and new 39 Ar-40 Ar data proves the reproducibility of age spectra and their shapes. This quantifies the analytical reliability of the irradiation and mass-spectrometric analyses. Anomalous age spectra are a reproducible property of some specific samples and correlate with mineralogical anomalies. The present data allow us to fine-tune the age of the volcanostratigraphic units of Monte Vulture during the known interval of main volcanic activity from ca. 740 to 610 ka. After a very long stasis, the volcanic activity in the Monte Vulture area resumed with diatremic eruptions, one of which (Lago Piccolo di Monticchio, the site of a palynologicalpaleoclimatological drilling) was dated at ca. 140 ka.

show abstract

Section: Spinoritola Subsynthemmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%