Lüliang new rock drill


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A torsional-axial vibration analysis of drill string endowed with

In this paper, a lumped mass model is proposed to investigate the torsional-axial vibration behavior of drill string. This model exclusively involves

The late-Paleoproterozoic I

Abstract The late-Paleoproterozoic granitoids from Lüliang Complex can provide pivotal constraints on the amalgamation process between Eastern and Western blocks of

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New Evidence for the formation age of the Lüliang Group

Based on previous studies and the zircon dating data in this work, the Lüliang Group is considered to form in a tectonic setting of the Neoarchean back-arc basin.

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Experimental study on motion and mechanical characteristics of

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Formation age and tectonic setting of the Lüliang Group in the

Investigations of the formation age and tectonic setting of the group are helpful for understanding Neoarchean-Paleoproterozoic regional tectonic evolution. Petrography, geochemistry, and

Geochemistry and U–Pb zircon ages of metamorphic volcanic

New LA-ICP-MS U–Pb zircon analyses on two metamorphosed volcanic rocks from the Yejishan and Lüliang groups reveal magmatic crystallization ages of 2210 ± 13 Ma and

A Long-Lived Accretionary Process during the

In this study, we present a comprehensive analysis of the late Neoarchean to Paleoproterozoic granitoids within the Lüliang Complex, including whole-rock major and trace

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New Evidence for the formation age of the Lüliang Group

Protolith age and geochemical characteristics of meta-basic volcanic rocks from Lüliang Group in the Lüliang complex and its tectonic setting

Geochemical constraints on the origin of Neoarchean

In this study, we report new zircon U-Pb age and Lu-Hf isotope data for the Neoarchean magmatic rocks from the Lüliang area in the TNCO, as well as the whole-rock

Geochronological and geochemical constraints on the Lüliang

In this paper, we carried out detailed geochemical and geochronological investigations on the metabasites and associated meta-sedimentary rocks from the Lüliang

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19h Hydraulic Rock Drill mounted on all brands of the excavator It has drilling speed 2-3 meters/min, hole 34mm. one rod is 3.7meter. widely used in all kinds of hard, medium and soft

Axial-lateral-torsional coupling nonlinear vibration of riserless drill

The existing research shows that the vibration of a drill-string can be divided into three types according to the different dominant modes: axial, lateral and torsional vibration

Study on Dynamic Characteristics of Drill String Considering Rock

Most downhole tools are connected to the lower end of drill string and move with it. It is necessary to understand the motion state and dynamic characteristics of drill string, which will affect the

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About Lüliang new rock drill

About Lüliang new rock drill

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6 FAQs about [Lüliang new rock drill]

How old is a zircon rock in the Lüliang group?

Four samples from the metamorphic volcanic rocks of the Lüliang Group were analyzed using the Sm–Nd isochron dating method and defined an isochron age of 2351 ± 56 Ma with the corresponding initial 143 Nd/ 144 Nd ratio of 0.50958 ± 5 and ɛ Nd (t) of −0.3 ± 0.5 (Geng et al., 2000), which is slightly older than the ∼2.2 Ga zircon age of this study.

What are the rough ages of the Lüliang group?

Three rough ages were reported for the metavolcanic rocks of the Lüliang Group, including a whole rock Sm–Nd isochron age of 2360 ± 95 Ma (Geng et al., 2000), and single-grained zircon U–Pb ages of 2051 ± 68 Ma and 2099 ± 41 Ma (Yu et al., 1997).

Which granitoids are found in Lüliang complex?

In this study, we present a comprehensive analysis of the late Neoarchean to Paleoproterozoic granitoids within the Lüliang Complex, including whole-rock major and trace element compositions, secondary ion mass spectrometry (SIMS) zircon U–Pb geochronology, and in-situ zircon Hf–O isotopes.

Was the Lüliang complex metamorphosed in the Paleoproterozoic?

These new ages, integrated with recently reported U–Pb zircon ages for the Jiehekou Group and Paleoproterozoic granitoids, suggest that all of the lithological assemblages of the Lüliang Complex formed and were metamorphosed in the Paleoproterozoic, not in the Neoarchean.

Where is the Lüliang complex located?

The Lüliang Complex is situated in the central section of the TNCO and includes various late Neoarchean to Paleoproterozoic granitoid plutons and meta-supracrustal rocks.

Where is the Lüliang group located?

The Lüliang Group is distributed in the central part of the PLC and comprises greenschist- to amphibolite-facies metamorphosed sedimentary rocks with banded iron formation (BIF) in the lower sequence and metamorphosed volcanic rocks (e.g. basalt, andesite and dacite) in the upper part (Yu et al., 1997).

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