Tarom Basin

Published: 12-01-2021| Version 2 | DOI: 10.17632/n5z4h9dy6x.2
Contributors:
Mohammad Paknia,
Paolo Ballato,
Massimo Mattei

Description

Research hypothesis This study provides new constraints on the tectono-stratigraphic evolution of the Tarom intermontane basin deposits of unknown age (deposition occurred any time after Eocene) in the framework of collisional deformation and plateau building processes. What the data show Folder 1: Analyzed ChRM (characteristic remanent magnetization) data set for samples come from TV, KA and GH measured sections in the basin. Folder 2: Excel files include ChRM and viscous magnetic components, stratigraphic level, declination, inclinations, latitude of Virtual Geomagnetic Poles/VGP, NRM (natural remnant magnetization), magnetic susceptibility (K), maximum angular deviations (MAD), range of demagnetization processes and discarded components. The high quality ChRM (stable directions, MAD <10°) were selected for paper. Folder 3: Fold and reversal paleomagnetic tests were done to verity the reliability of the ChRM dataset. How the data can be interpreted K is a measure of how much a material will become magnetized in an applied magnetic field. NRM is the magnetization carried by magnetic minerals. NRM is a vector which has: Direction: declination (D) and inclination (I), Intensity (A/m), normal (N) and reverse (R) Polarity. Our data show TV and KA samples sourced from Eocene volcanic along southern margin with K higher than GH samples. Conversely, GH sediments sourced from both basin margin with lower K. NRM carries two magnetic components. The most important component of remanence is acquired when a rock is formed/ ChRM. Any later component is called a viscous (an unwanted magnetic component recorded in rocks). Sufficient description to enable others to understand what the data is, how was gathered, how to use Viscous and ChRM components isolated after demagnetizing the samples (Thermal and AF methods). The viscous components removed below 350°C (thermal) and 15 mT (AF), while ChRM components removed between 530 - 580/640°C and between 20 - 100/120 mT. The dominant ChRM were successfully isolated after removing secondary component. The dominant carriers of the ChRM in samples are magnetite and hematite (Curie temperature 580 and 640/680°C, respectively). ChRM data allowed determining N/R polarities. The rest of samples were rejected because of unstable ChRM or MAD >10°. The paleomagnetic analysis was done using Rema soft software, format of analyzed files is rs3. The selected ChRM allowed determining polarities/VGP latitude and hence to build up a local magnetic polarity stratigraphy to be correlated with the Geomagnetic Polarity Time Scale (GPTS). Based on our new ages (U-Pb zircon dating and magnetostratigraphic correlation), we propose an evolutionary model for the last ~38-36 Ma in the Tarom Basin. To perform the fold test a text file was created for all data set, includes (from left to right); D, I, Dip Dir, and Dip (D/I of analyzed samples, Dip Dir/Dip of bedding. 2) to perform the reversal test 3 text files created including D/I.

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