Geochronology and Thermochronology

Geochronology and Thermochronology

An author of well over papers in professional journals, Kip has done field research in the Arctic both in Norway and Greenland , western North America, the Peruvian Andes, and especially the Himalayan-Tibetan orogenic system of India, Nepal, and Tibet. Recently, he has worked to design protocols and astronaut training programs for planetary field geology in conjunction with NASA’s rekindling of its program of human exploration of the Moon and, eventually, Mars. He has extensive laboratory and field experience with a focus on the use of noble gas isotope and abundance variations as tracers of geologic processes. Field areas where he has worked include: Research projects have involved the application of this technique to determine argon diffusion and solubility parameters of feldspars and feldspathoids and the partitioning of nobles gases between minerals and melts, for use in resolving the timing and rates of geological processes. She has been fortunate enough to work with a number of gifted researchers on a diverse series of projects, including:

Thermochronology, Mount Kinabalu

Argon studies of hydrous K-bearing minerals on planetary surfaces In the next decade, NASA plans a Mars Sample Return mission in which samples will be collected from carefully selected landing sites that are most promising as environments for present or past life. In preparation for a Mars sample return mission we are investigating terrestrial analogues of minerals known to exist on the Martian surface from data obtained by previous NASA missions.

We have experimentally determine the kinetics of argon in both natural jarosite. Why is this important? Results of argon diffusion experiments on jarosite will permit a more accurate interpretation of argon data obtained on jarosite samples on Earth , as well as samples returned from Mars.

Dating of major normal fault systems using thermochronology’ An example from the Raft River detachment, Basin and Range, western United States Michael L. Wells Department of Geoscience, University of Nevada, Las Vegas Lawrence W. Snee u.s. Geological Survey, Denver, Colorado Ann E. .

When the Mariner 9 probe arrived at Mars in , the world expected to see crisp new pictures of surface detail. Instead they saw a near planet-wide dust storm [53] with only the giant volcano Olympus Mons showing above the haze. The storm lasted for a month, an occurrence scientists have since learned is quite common on Mars. Using data from Mariner 9, James B.

Nevertheless, no actual transport of material was observed at either site, only a gradual brightening and loss of contrast of the surface material as dust settled onto it. A day later the storm “exploded” and became a global event. This was attributed to the global covering of light-colored dust that settled out of the dust storm, temporarily increasing Mars’ albedo.

Climate of Mars

Godthelp in Hill, Robert S. White, , The Nature of Hidden Worlds: Australian Conservation Foundation, Melbourne. Michael Archer, Suzanne J. Gehling, Kathleen Grey, Guy M.

Low-temperature thermochronology October 23, Geochronology versus thermochronology • Geochronology is the science of dating.

Therefore RATE must propose that almost all of this decay occurred during the one-year flood, because for some unknown reason the decay rate for some atoms but not others was extremely high but only for a year, not before or after. This amount of decay would produce an immense amount of heat quickly, in less than a year. This would be a “super-catastrophic flood” producing results far beyond anything we actually observe in the geological record of the earth.

In addition to this heat-producing radioactive decay, young-earth explanations for flood geology require other heat-producing processes — volcanic magma, limestone formation, meteor impacts, biological decay, plus more heat with any of the models Vapor Canopy, Hydroplate, Comet, Runaway Subduction proposed to answer the question, “Where did the Flood water come from, and where did it go?

Is there a young-earth solution? No known thermodynamic process could account for the required rate of heat removal nor is there any known way to protect organisms from radiation damage. Yet they are so confident that these problems will be resolved that they encourage a message that the reliability of [their young-earth interpretation of] the Bible has been confirmed.

Vorlesungsverzeichnisse

Research – Papua New Guinea Scope of Project In eastern Papua New Guinea, the westward propagating Woodlark Basin sea floor spreading center terminates along strike into one of the most rapidly extending rifts on our planet- the Woodlark Rift. We are using eastern Papua New Guinea PNG as a field laboratory to examine how the lithosphere has evolved petrologically, rheologically, and thermally during the transition from subduction to rifting and seafloor spreading.

Two key questions in continental dynamics are addressed in this research:

TANG 3 O is a voluntary association of Australian researchers in the fields of thermochronology, noble gas geochemistry, and geochronology for the purpose of optimising access to facilities and results, enhancing technical developments and technique implementation, and creating a forum for dissemination of technical advances and research.

Low-temperature thermochronology can be used to study ancient geologic processes. Abstract Low-temperature thermochronometric dating techniques are commonly used to reveal and quantify the spatial and temporal pattern of cooling and exhumation in many active mountain belts. These methods illuminate the relationship between rock exhumation, and the processes that bring rock to the surface, including climate-driven surface processes.

Thermochronological studies on rocks in ancient settings Precambrian and Paleozoic are far more complicated, and in general have largely failed to reveal exhumation processes in orogenic belts, mainly due to imprecision of the technique, complications from radiation damage, and subsequent resetting. However, in a few locations, remnants of the exhumation record of ancient orogens may be studied with low-temperature dating techniques and in these cases we can gather first-order information on tectonics, thermal events, and exhumation processes that have occurred in the deep past.

We review several case studies from the Northern Appalachians, central Argentina, the Canadian Shield, central Wyoming, and the European Variscides where thermochronology data have been successful in reconstructing geologic processes in deep-time that have affected the upper crust.

Geochronology and Thermochronology

Investigating the complex interplay between tectonics and sedimentation is a key endeavor in modern earth science. Many of the world’s leading researchers in this field have been brought together in this volume to provide concise overviews of the current state of the subject. The plate tectonic revolution of the ‘s provided the framework for detailed models on the structure of orogens and basins, summarized in a textbook edited by Busby and Ingersoll.

Tectonics of Sedimentary Basins: Recent Advances focuses on key topics or areas where the greatest strides forward have been made, while also providing on-line access to the comprehensive book. Breakthroughs in new techniques are described in Section 1, including detrital zircon geochronology, cosmogenic nuclide dating, magnetostratigraphy, 3-D seismic, and basin modelling.

Geochronology and Thermochronology Using Apatite: Time and Temperature, Lower Crust to Surface. 6 Pages. Geochronology and Thermochronology Using Apatite: Time and Temperature, Lower Crust to Surface /He (40 – 80 °C) elements that can be used for age dating makes apatite a methods make them popular tools for studying upper very useful.

This study reports detrital thermochronology results from the Paleocene through middle Miocene Magallanes Basin strata. To quantify the magnitude of basin reheating and assess the range of plausible thermal histories for these sediments, we performed thermal modeling of detrital age distributions. The magnitude of basin reheating that we have documented appears to be unusual in foreland basins and suggests that burial of the Paleocene deposits was much deeper than previously thought based upon stratigraphic thicknesses.

In light of the thermal contrast above and below this unconformity, we suggest that up to 3 km of missing sedimentary section may be represented by this unconformity. Thermochronology and modeling results from the Paleocene-middle Miocene stratigraphic section suggest that: Additionally, we document rapidly-cooled Paleogene zircons that were probably derived from erosion of extensive volcanic rocks that blanketed the orogen and have since been eroded. Coupled detrital zircon thermochronology and this innovative thermal modeling approach offers a simple and effective method to test geologic models based on sediment recycling in fold-thrust belt settings and post-depositional burial heating.

Tectonics, Structures and FT Thermochronology

Relative dating Cross-cutting relations can be used to determine the relative ages of rock strata and other geological structures. Methods for relative dating were developed when geology first emerged as a natural science. Geologists still use the following principles today as a means to provide information about geologic history and the timing of geologic events. The principle of uniformitarianism states that the geologic processes observed in operation that modify the Earth’s crust at present have worked in much the same way over geologic time.

In geology, when an igneous intrusion cuts across a formation of sedimentary rock , it can be determined that the igneous intrusion is younger than the sedimentary rock. Different types of intrusions include stocks, laccoliths , batholiths , sills and dikes.

Read “Sm–Nd dating of spatially controlled domains of garnet single crystals: a new method of high-temperature thermochronology, Earth and Planetary Science Letters” on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Research – Pyrenees Tectonic evolution of the Pyrenean orogen The Pyrenees are a doubly-vergent collisional orogen formed since the Late Cretaceous as a result of convergence between the European and Iberian plates. The core of the range i. Axial Zone is an antiformal south-vergent duplex structure composed of imbricate thrust sheets of Hercynian basement Figure 1. The Axial Zone itself is flanked to the north and south by fold-and-thrust belts. The principal objectives of this project are to use low-medium temperature thermochronology, applied with a systematic sampling strategy to constrain the denudation history of the Pyrenean orogen and hence to constrain it’s tectonic evolution and therefore to better understand geologic processes associated with accommodation of the upper crust during convergence and thrusting.

Pyrenees Mountains Figure 1. Generalized tectonic maps of the Pyrenees, highlighting main structural units and significant Hercynian massifs. Approach The Pyrenees are often cited as being an ideal natural laboratory to study tectonic processes involved in formation of collisional orogens because of their relatively small size, quality of exposure, preservation of syn-orogenic sedimentary strata and absence of significant late-extensional collapse structures.

However, it is the variation in structural style along-strike due to the decreasing amount of shortening from east to west that permits geologic processes associated with convergence to be better evaluated. By relating the along-strike variation in denudation history with the variation in structural style we will learn more about collisional tectonics within this orogen. We are focusing on the following questions. Does denudation become younger, of lesser magnitude and less asymmetric, to the west as predicted by decreasing estimates of the total amount of shortening from east to west and the change in structural style?

How do the across-strike patterns spatial and temporal of denudation change along-strike? Do denudation rates change as a function of how convergence is accommodated through time, as observed in the central Pyrenees, or do denudation rates vary along along-strike?

hodges group | integrated earth and space science

Dynamic thermochronological study of Mt Kinabalu, Sabah, Malaysia Christian Sperber, completed PhD This project intends to apply cutting-edge low-temperature thermochronological techniques to resolve the tectonic and structural evolution of Mt Kinabalu, the highest mountain in Southeast Asia. This enigmatic peak stands out dramatically from the regional topography, with its m summit rising above a massif largely below m high, and with few other peaks up to m.

The full relief of Mt Kinabalu is even greater, as immediately to the north the topography descends rapidly to depths of more than m in the Sulu Sea. The mountain is composed of granite, and although the exact age of intrusion is uncertain, it is estimated to behave been emplaced and exhumed in a total of less than 15 Ma.

-Research Assistant responsible for the daily operations of the (U+Th)/He thermochronology laboratory. -Formulated Masters thesis under the advisement of Dr. Peter Copeland, “A Field Diffusion Study of Helium in Calcite: Using the (Uranium+Thorium)/Helium Dating Method for Low-Temperature Thermochronometry”Title: Senior Geologist at AECOM.

After seriously considering an English major and after a, let just say, “challenged” first year, I recovered to take an undergraduate degree in Earth Sciences before earning my Ph. My research interests have included development of techniques in geochronology, with a focus on noble-gas methods and thermochronology and their application to tectonics. I’m also interested in crustal geodynamics, the nature and origin of mountains, and the geologic evolution of Asia, where I’ve worked for 30 years!

I’ve served on the editorial board of the journal Geology, am currently on the advisory board of the journal Earth and Planetary Science Letters, and I’ve served as a panel member for the Continental Dynamics program of the U. I’m thrilled and honored to have been named a Fellow of the American Geophysical Union in and to have received the Dodson prize in thermochronology in Currently I’m Chair of the International Standing Committee on Thermochronology, which oversees the continuity and planning for international conferences every two years.

At Lehigh, I’ve served as department chair from and to I teach graduate courses about tectonic processes and geochronology, and undergraduate courses about the Earth system and energy issues. I’ve also taught first-year seminars on such topics as energy, disaster movies, Himalayan exploration, and environmental change. Research Interests I’m currently working in two areas: I’m particularly interested in the influence that surface processes have on tectonic processes and dynamics.

Recent Students Jennifer Schmidt Ph. Applications of thermochronometry along the Tibetan Plateau margin”. Geochronology and geochemistry of intraplate volcanic rocks and lower-crustal xenoliths” Mongolia.

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Links My research spans a wide range of geological problems, with a common thread being developing computational methods to address all stages of the scientific process, from data acquisition and processing to information mining to numerical modeling. I have two primary research areas. One is the application of high-resolution X-ray computed tomography to a diverse spectrum of disciplines, including paleontology, petrology, hydrogeology, structural geology, economic geology and planetary science.

I am putting together a state-of-the-art fission-track lab indended for both experimental and field-problem-oriented work.

New (U-Th)/He thermochronology data from the syn-extensional granitoids in the central part of the Menderes Massif in western Turkey reveal a minimum slip rate of km/Myr along the Alasehir detachment (~14° dip angle) and denudation rates between km/Myr and .

Muscovite samples with an age difference as small as 2. Statistics are even better for comparison of multiple samples from separate events; that is, a difference of 0. The major tin and tungsten ore-forming stages, which are the oxide-silicate stage, the main sulfide stage, and greisenization, occurred between The first substage of the oxide-silicate stage was a short-lived thermal pulse at The main sulfide stage was active at A second substage of the oxide-silicate stage occurred as a short-lived thermal pulse at

Greg Balco – Cosmogenic-Nuclide Geochronology



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