Dating lava flows for paleomagnetic

The future duration of this decrease is unpredictable.We try to understand the underlying processes by reconstructing the past field changes. Two categories of data form the important basis for our work: directly observed data and paleomagnetic data obtained in laboratory work.

Knowledge about past geomagnetic field variations and a better understanding of the underlying processes deep inside the Earth are necessary to estimate the future evolution of the geomagnetic field.New K/Ar ages ranging from 50 ka to I Ma have been obtained on andesites using the Cassignol-Gillot technique at the Université Paris Sud - Institut de Physique du Globe de Paris Orsay laboratory.Additional flows (with K/Ar ages obtained using the same dating technique) were also sampled for paleomagnetic investigations.The (very similar) paleomagnetic directions gathered from eight internally consistent sites were compared to reference geomagnetic field directions of the last 5–10 ka.Directions from Cuddia del Gallo agglutinate and Khaggiar flows translate into 5.9- to 6.2-ka ages, whereas the Fastuca pumices yield a slightly older age of 6.2–6.8 ka.More than 200 samples were analyzed using both alternating field AF and thermal stepwise demagnetization techniques.


Leave a Reply

  1. Adult dating site passwords 30-Nov-2016 10:19

    She plays mind games, constantly asks me for advice on “what to say to a guy” and generally reminds me of myself in the first few years of dating.

  2. philippine online dating sites 22-Jul-2016 18:43

    We'd just come back from visiting my parents with our five-year-old son, Jamie.

  3. does bible say christian dating 27-Nov-2016 03:47

    As you explore our various features, you will see how awesome Sexchatster is.

  4. what is a good age to start dating 15-May-2017 06:30

    In order to be also present in the market for sex cams with something new, Yq launches outdoor cam girls category. Net amateurs girls from around the world make naked show behind their cam. cctrl=public,max-age=518400&quality=77&imagesource=IMLFOH&mark=1&watermark=0&width=422&height=315&filename=0092/891092/891092O1395326789.jpg" data-r-id="10" data-price-id="4" data-price="1.48" data-is-hh="True" data-is-online="true" data-bio-page="/live-sex-chat/cam-girls/XSugar Bibi X" data-is-auto-play="false" data-is-room-full="False" //

  5. we are updating our records 02-Oct-2016 01:12

    A professional and feature-rich matchmaking site such as Free Dating Australia provides single Australians with a simple yet powerful tool to help you step things up in your life as a single guy or girl.

  6. creampie dating sites 07-Aug-2016 20:20

    “The guy I met with, and ended up dating until it got bad, only spoke to someone on the phone," another insider tells me. He just sent them photos of himself and says he definitely got the hard sell from them. They will set you up with as many girls as you want for that price.” While taping a scripted show with Stanger a few weeks ago in Los Angeles, the tight-lipped matchmaker was far more interested in getting me to spill the beans on Jennifer Lopez’s breakup than answering any of my questions about her business!