PROVENANCE STUDY BY U-Pb DATING OF THE DETRITAL ZORCONS IN THE YANGTZE RIVER

The Huajian gold deposit is one of the largest hydrothermal intrusion-related gold deposits in eastern Hebei Province, located in the northern margin of the North China Craton NCC. The mineralization in this district displays a close spatial association with the shoshonitic Niuxinshan intrusive complex NIC , which contributes to the characterization of the metallogeny associated with convergent margin magmatism. The new geochronological data constrain the timing of the tectonic transformation between and Ma. The other group exhibits flat REE patterns with obvious negative Eu anomalies, higher Yb, lower Sr, and weak NTT anomalies, which indicate an intra-plate extensional environment with a thinning crust. This is interpreted to be genetically related to the crystallization of the shallow crustal-sourced portions of this complex. Additionally, a tectonic model is presented that provides a plausible explanation for the abundant polymetallic mineralization that occurs in the northern margin of the NCC after Ma. The association of mineralization with shoshonitic magmatism is a characteristic feature of the northern part of the North China Craton NCC [ 1 — 4 ]; however, this has not been previously described in detail for Huajian gold deposit Fig 1. Recently, dates for some deposits of the Middle Triassic-aged intrusive rocks, located in the northern part of the NCC, were obtained [ 5 — 12 ]. Particular tectonic environments are closely connected with the emergence and distribution of these deposits [ 5 ] [ 6 — 10 ], [ 11 , 12 ], [ 13 ]. Therefore, the identification of varying tectonic settings in an area is useful for locating mineral deposits, also for identifying different metallogenic belts and their metallogenetic potential [ 14 , 15 ].

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An Introduction to U-Pb Geochronology (from a SHRIMPer’s point of view) Ian S. SHRIMP U-Pb dating in practice Pb/U ages can be measured with better than.

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Article views PDF downloads 2 Cited by. The overlap and similarity analysis of all the samples are in an excess of 0. It means that all the samples have the similar U-Pb ages. By comparison of the U-Pb age patterns with the potential source areas of Qiangtang Block, Yidun Volcanic Arc, Songpan-Ganze basin, Yangtze Craton, Qinling orogen and Dabie orogen, it is found that the four age groups mentioned above appeared in almost all the regions except the Qiangtang Block and Yidun Volcanic Arc, hence it is hard to distinguish the final source by U-Pb dating.

Meanwhile, the U-Pb age patterns of the Red River and Mekong River sediments are close to those of the Yangtze River, suggesting that the U-Pb dating of detrital zircons can not work well in the Yangtze River as there are no exclusive age indicators.

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Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable. Unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence. Uranium comes in two common isotopes with atomic weights of and we’ll call them U and U. Both are unstable and radioactive, shedding nuclear particles in a cascade that doesn’t stop until they become lead Pb.

The two cascades are different—U becomes Pb and U becomes Pb. What makes this fact useful is that they occur at different rates, as expressed in their half-lives the time it takes for half the atoms to decay. The U—Pb cascade has a half-life of million years and the U—Pb cascade is considerably slower, with a half-life of 4. So when a mineral grain forms specifically, when it first cools below its trapping temperature , it effectively sets the uranium-lead “clock” to zero.

Lead atoms created by uranium decay are trapped in the crystal and build up in concentration with time. If nothing disturbs the grain to release any of this radiogenic lead, dating it is straightforward in concept. First, its chemical structure likes uranium and hates lead. Uranium easily substitutes for zirconium while lead is strongly excluded. This means the clock is truly set at zero when zircon forms. Its clock is not easily disturbed by geologic events—not erosion or consolidation into sedimentary rocks , not even moderate metamorphism.

A stochastic sampling approach to zircon eruption age interpretation

How to get a good woman. Relative age dating activity answer key karnataka – Should a man suddenly have stomach pains, if his thighs and genitals are sore, this man will have pains In the anus whenever he walks. In this activity, students develop a timescale for a person’s life. Principle of original horizontality 9.

Download figure as PowerPoint slide. Concordia diagrams of Pb/Pb vs. U/Pb for calculating the age.

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Keller, B. Schoene, K. Keller Email: cbk29 cornell. Keller, C. Keywords : geochronology, Bayesian statistics, zircon age distribution.

they are difficult to date by the Rb/Sr and U/Pb methods. (especially if very old, partly altered and do not contain zircon). •. Dating high-grade metamorphism.

Traditionally, the importance of zircon ZrSiO 4 is known for its geochronological dating, but zircon trace element geochemistry is an emerging field to interpret tectonic settings [ 1 , 2 , 3 ]. Titanium present in the zircon can help calculate the temperature of the rocks, and the Hf isotopic study can play a significant role to unravel crustal recycling [ 4 , 5 , 6 , 7 ].

Zircon occurs in several igneous, sedimentary and metamorphic rocks as an accessory mineral [ 5 ]. It is due to its high durability and stability to harsh physical and chemical weathering as well as due to its dominant role in the growth with granitoid petrology that it is regarded as the most common mineral used in igneous, metamorphic and sedimentary petrology [ 10 , 11 ].

Trace element geochemistry in zircon is an emerging field to interpret the origin and the tectonic setting of igneous rocks [ 2 , 12 , 13 ], and this technique is applied for the first time on the Swat orthogneisses, Northern Pakistan. As hafnium is most compatible with zircon, the ages determined by the U—Pb dating are also used for the Lu—Hf isotope system, which is the best choice for determining the evolution of igneous and metamorphic rocks in collisional zones [ 15 ]. The zircon is a very resistant mineral to harsh chemical and physical weathering, and during physical weathering, the zircon moves to the sand portion along with hafnium, while the Lu is discarded into the clay portion, which is the basis for finding the geochemical settings [ 5 , 16 ].

Although the importance of Hf as a geochemical tracer was recognized in the early s, Hf separation was very difficult, and later the MC-ICP-MS technique was adopted to determine the accurate ratios of Hf isotopes in the zircon, which is a revolution to study the mantle crust processes in detail as a geochemical tracer in subduction settings [ 17 , 18 ].

The Hf isotopic record in the zircons is the best decipher for source rocks as well as plays important roles in the magma mixing, assimilation and petrogenesis [ 9 , 19 , 20 , 21 , 22 ]. It is noted that the geochemical behavior of Zr and Hf during magma crystallization is the same, and all the zircons have 0. The technique to determine the Hf isotopic ratio from the same spot that is used for finding the age is a new development in the petrochronology [ 24 , 25 , 26 ].

Crustal and mantle processes are particularly studied in detail by using the evolution of hafnium in zircon [ 29 ]. The morphology and the chemistry of trace elements of the zircon combined with the Hf isotope composition help interpret petrogenetic information [ 11 ].

GEOCHRONOLOGY 2006 Lecture 04 U-Th-Pb Dating

According to limited geochronology data, magmatic activity in the eastern Iran started in the late Jurassic Esmaiely et al. The volcanic rocks in Iran are mainly classified into three geographical categories as follows: a belt extended from Maku area to Bazman zone, the Alborz Mountains, and east territories of Iran Pazirandeh, The volcanic rocks in Iran have average andesitic composite but other types of the volcanic rocks such as rhyolite, dacite, trachyte, basalt, are also seen Pazirandeh,

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Radioactive dating indicates that the granite intrusion is million years old and the vesicular basalt is million years old. Create geologic cross sections from topographic and geologic maps. It is also an active subject, containing activities such as hands-on labs and experiments. Exercises in relative age dating The object of the exercise is to interpret a sequence of geologic events by studying the relationships between rocks and structures in the geologic cross-section in figure 4.

In this exercise, students learn and apply the concepts geologists use to determine the relative and absolute ages of rocks. The laboratory component of this course is designed to provide a hands-on learning experience including mineral and rock identification, relative age dating of earth materials by the application of stratigraphic principles, interpretation and analysis of geologic maps and cross sections, preparation and analysis of topographic maps, evaluation of plate tectonic processes including earthquakes.

The remains of an early dinosaur could be found at reference point. A diagram showing the geologic features that would be visible if vertical slices were made through part of the crust. Very good! You just did relative dating! As understood, capability does not suggest that you have fantastic points.

U-pb dating

Petrology Tulane University Prof. Stephen A. Nelson Radiometric Dating Prior to the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.

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Metamorphic rocks may be classified on the basis of foliation into two types. Loren A. Introduction Igpet is an interactive program for displaying and modeling geochemical data pertinent to Igneous Petrology. All chemical variation diagrams end abruptly at this end point, and this point is reached as soon as the. These vast magmatic events occur over geologically short timescales and include voluminous flood basalts, along with silicic and low-volume alkaline magmas. Data compiled by Rick Conrey personal communication.

Study of fractional and differential crystallization of magma. Typical texts on igneous and metamorphic petrology are geared to either advanced or novice petrology students. In igneous petrology, a wide variety of chemical variation diagrams are used to portray variations of chemical composition within and between rock suites.

How Old is that Rock?