Rates of Tectonometamorphic Processes from Rubidium and Strontium Isotopes in Garnet

Christensen, John N.; Rosenfeld, John L.; DePaolo, Donald J.

doi:10.1126/science.244.4911.1465

Cited by 286 publications

(101 citation statements)

References 17 publications

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“…The issue of how fast mineral reactions occur in rocks is one that has exercised petrologists and isotope geochemists alike (e.g, Wood & Walther 1983;Rubie & Thompson 1985;Christensen et al 1989;Vance & O'Nions 1990;Baxter & DePaolo 2000, 2002a. As we have noted earlier, an understanding of the relative rates of attainment of isotopic, chemical and textural equilibrium is one of the main problems barring progress in understanding isotopic ages in a petrological and structural context.…”

Section: Understanding Transport Processes In Rocksmentioning

confidence: 99%

“…Mezger et al 1989;Christensen et al 1989Christensen et al , 1994Vance & O'Nions 1990Burton & O'Nions 1991Vance et al 1998b;Vance & Harris 1999;Stowell et al 2001;Th6ni 2002;Stowell & Tinkham 2003) but it is not robust. It is the experience of the lead author on this paper that the success rate, as measured by the ability to obtain age precisions of 1-3 Ma, is less than 50%.…”

Section: Advances In the Chronometry Of Major Metamorphic Minerals -Pmentioning

confidence: 99%

“…The high quality petrology is combined with StaNd ages for cores and rims of garnet (cf. Christensen et al 1989Christensen et al , 1994Vance & O'Nions 1990Vance et al 1998b;Vance & Harris 1999) which leads to the distinction in time of contact and regional metamorphic events that are only 5-6 Ma apart. The ability to do this arises from the ability of garnet to preserve a reliable record of both pressure and time so that the timing of loading during regional metamorphism is extractable.…”

Section: Advances In the Chronometry Of Major Metamorphic Minerals -Pmentioning

confidence: 99%

“…Mezger et al 1989;Christensen et al 1989;Vance & O'Nions 1990;Burton & O'Nions 1991). Later, multicollector inductively coupled plasma mass spectrometry (MC-ICPMS) opened up other possibilities involving the Lu-Hf system (e.g.…”

Section: Advances In the Chronometry Of Major Metamorphic Minerals -Pmentioning

confidence: 99%

“…On the other side of the coin, however, the quantification of rates of metamorphic reactions has also been an important objective in chronological studies themselves (e.g. Christensen et al 1989;Vance & O'Nions 1990;Mtiller et al 2000;Baxter & DePaolo 2000, 2002a. The importance of this issue extends beyond mere idle curiosity: if rates of reaction are not fast enough to keep up with changes in intensive variables like P, T and the strain environment, then the whole concept of local equilibrium and the P-T-X-d-t data that are based on it are called into question.…”

Section: Understanding Transport Processes In Rocksmentioning

confidence: 99%

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Geochronology: linking the isotopic record with petrology and textures — an introduction

Vance

Müller

Villa³

2003

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Abstract:One of the key aims of geochronology, and the subject of the papers in this Special Publication, is the linkage of isotopic ages to petrological and textural information. A close link between the two types of information greatly improves the constraints available from geochronology on the nature and rates of lithospheric processes such as metamorphism and deformation. There have been several key advances in this area over the past 10-20 years, relating to increased precision and accuracy of isotopic ages but also, and crucially, to the spatial resolution available to geochronologists. This resolution now approaches that on which petrological, chemical and textural information is obtained. We also, in this introduction, identify the barriers that have impeded further progress, which relate both to technical issues as well as to problems of understanding. Finally we set the papers in this volume in the context of the preceding discussion and outline the key ways in which these papers point towards further progress in the future.Time has always been recognized as a key variable in the Earth sciences, both in its own right and through the constraints that chronological information provides on the rates of, and hence the physical mechanisms for, Earth processes. In the study of the dynamics of the Earth's lithosphere during orogenesis and metamorphism, one of the key requirements of any time datum is that it is relatable in a straightforward manner to other geological information, such as data on temperature, pressure and deformation. It is only through this linkage that chronometric information can achieve its full potential in contributing to progress in understanding the dynamics of mountain belts and other metamorphic settings. This linkage is the focus of the set of papers in this volume, which emanate from a special symposium at the 2002 Goldschmidt Conference, held at Davos, Switzerland. The topic under discussion has been the subject of a review by one of us recently (Mtiller 2003). Inevitably, there is some overlap between this paper and Miiller (2003). However, the emphasis of the two papers is slightly different, with Mtiller (2003) concentrating largely on new in-situ techniques and their resulting prospects, whereas here we give a broader overview of the whole subject, with more emphasis on the dating of high temperature processes and the interrelated achievements of both modelling and experimental work in petrology. We also aim to highlight some general issues that are dealt with in specifics in the subsequent contributions. First, we give a brief account of the progress that has been made over the past two decades in our ability to extract the timing and conditions of deformation and metamorphism from minerals and in the interpretive framework in which these new data are analysed. Next we identify three key barriers that initially impeded further progress and which have been and continue to be the subjects of intensive research eflbrt. Finally, we discuss ways that are being developed to surm...

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